Researchers on the ICESCAPE mission, funded by NASA, examine melt ponds and their surrounding ice in 2011 to see how changing conditions in the Arctic affect the biological and chemical makeup of the ocean. NASA / Flickr
By Alex Kirby
The temperature of the Arctic matters to the entire world: it helps to keep the global climate fairly cool. Scientists now say that by 2035 there could be an end to Arctic sea ice.
<p>The northern polar ocean's sea ice is a crucial element in the Earth system: because it is highly reflective, it sends solar radiation back out into space. Once it's melted, there's no longer any protection for the darker water and rock beneath, and nothing to prevent them absorbing the incoming heat.</p><p>High temperatures in the Arctic during the last <a href="https://www.ncdc.noaa.gov/abrupt-climate-change/Glacial-Interglacial%20Cycles" target="_blank">interglacial – the warm period around 127,000 years ago</a> – have puzzled scientists for decades.</p><p>Now the <a href="https://www.metoffice.gov.uk/weather/climate-change/organisations-and-reports/met-office-hadley-centre/index" target="_blank">UK Met Office's Hadley Centre</a> climate model has enabled an international research team to compare Arctic sea ice conditions during the last interglacial with the present day. Their findings are important for improving predictions of future sea ice change.</p>
<p>What is striking about the latest research is the date it suggests for a possible total melt − 2035. Many studies <a href="https://climatenewsnetwork.net/arctic-ocean-ice-free-mid-century/" target="_blank">have thought a mid-century crisis likely</a>, with another even <a href="https://phys.org/news/2019-11-arctic-ocean-ice-free-year.html" target="_blank">carefully specifying 2044 as the year to watch</a>. So a breathing space of only 15 years may surprise some experts.</p><p>During spring and early summer shallow pools of water form on the surface of the Arctic sea ice. These "melt ponds" help to determine how much sunlight is absorbed by the ice and how much is reflected back into space. The new Hadley Centre model is the UK's most advanced physical representation of the Earth's climate and a critical tool for climate research, and it incorporates sea ice and melt ponds.</p><p>The researchers report their findings in the journal <a href="https://www.nature.com/articles/s41558-020-0865-2" target="_blank">Nature Climate Change</a>. Using the model to look at Arctic sea ice during the last interglacial, they concluded that the impact of intense springtime sunshine created many melt ponds, which played a crucial role in sea ice melt. A simulation of the future using the same model indicates that the Arctic may become sea ice-free by 2035.</p>
<p>The joint lead author of the team is <a href="https://www.bas.ac.uk/profile/marino/" target="_blank">Dr Maria Vittoria Guarino, an earth system modeller at the British Antarctic Survey (BAS) in Cambridge</a>. She says: "High temperatures in the Arctic have puzzled scientists for decades. Unravelling this mystery was technically and scientifically challenging. For the first time, we can begin to see how the Arctic became sea ice-free during the last interglacial.</p><p>"The advances made in climate modeling mean that we can create a more accurate simulation of the Earth's past climate which, in turn, gives us greater confidence in model predictions for the future."</p><p><a href="https://www.bas.ac.uk/profile/lsim/" target="_blank">Dr. Louise Sime, the group head of the palaeoclimate group and joint lead author at BAS</a>, says, "We know the Arctic is undergoing significant changes as our planet warms. By understanding what happened during Earth's last warm period we are in a better position to understand what will happen in the future.</p>
Melt Ponds Crucial
<p>"The prospect of loss of sea ice by 2035 should really be focusing all our minds on achieving a low-carbon world as soon as humanly feasible."</p><p><a href="http://www.reading.ac.uk/search/search-staff-details.aspx?id=10813" target="_blank">Dr. David Schroeder from the University of Reading</a>, UK, who co-led the implementation of the melt pond scheme in the climate model, says, "This shows just how important sea ice processes like melt ponds are in the Arctic, and why it is crucial that they are incorporated into climate models."</p><p>The extent of the areas <a href="https://nsidc.org/cryosphere/seaice/characteristics/formation.html" target="_blank">sea ice</a> covers varies between summer and winter. If more solar energy is absorbed at the surface, and temperatures rise further, a cycle of warming and melting occurs during summer months.</p><p>When the ice forms, the ocean water beneath becomes saltier and denser than the surrounding ocean. Saltier water sinks and moves along the ocean bottom towards the equator, while warm water from mid-depths to the surface travels from the equator towards the poles.</p><p>Scientists refer to this process as the ocean's global "conveyor-belt." Changes to the volume of sea ice can disrupt normal ocean circulation, with consequences for global climate. </p>From Your Site Articles
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A newly developed catalyst would transform carbon dioxide from power plants and other sources into ethanol. DWalker44 / E+ / Getty Images
Researchers at the Department of Energy's Argonne National Laboratory have discovered a cheap, efficient way to convert carbon dioxide into liquid fuel, potentially reducing the amount of new carbon dioxide pumped into the atmosphere.
<p>The method, published in <a href="https://www.nature.com/articles/s41560-020-0666-x" target="_blank">Nature Energy in late July</a>, uses a copper-based catalyst to transform carbon dioxide into ethanol, which is used in almost all U.S. gasoline.</p><p>"The process resulting from our catalyst would contribute to the circular carbon economy, which entails the reuse of carbon dioxide," study coauthor and Argonne senior chemist Di-Jia Liu explained in a <a href="https://www.anl.gov/article/turning-carbon-dioxide-into-liquid-fuel" target="_blank">press release</a>.</p>
<p>Catalysts are an important tool in industrial processes used to speed up chemical reactions, Argonne National Laboratory explained. In conventional energy, they are used to convert heavy <a href="https://www.ecowatch.com/tag/oil" target="_self">oil</a> into jet fuel and gasoline. The new catalyst would be put to less carbon-intensive purposes by converting the carbon dioxide emitted by <a href="https://www.ecowatch.com/tag/fossil-fuel" target="_self">fossil-fuel</a> plants or alcohol fermentation into ethanol that could be either recycled as fuel or used to make chemicals, drugs or cosmetics. Liquid fuel can also be used to store the output from <a href="https://www.ecowatch.com/renewable-energy/" target="_self">renewable energy</a> for future use, the paper explained.</p>
<p>In a 2019 <a href="https://www.vox.com/energy-and-environment/2019/11/13/20839531/climate-change-industry-co2-carbon-capture-utilization-storage-ccu" target="_blank">deep-dive for Vox</a> on different potential uses of carbon dioxide, David Roberts pointed out that it is always better from a <a href="https://www.ecowatch.com/climate-change/" target="_self">climate crisis</a> standpoint to electrify energy use directly rather than using that power to convert carbon dioxide into fuel. However, carbon-based fuels could be an important tool for reducing the emissions of sectors that are hard to decarbonize otherwise, like industry. They do not remove carbon dioxide from the atmosphere, but they do reduce the amount of planet-warming emissions relative to what they would have been if conventional fuels were burned.</p><p>"Carbon-neutral liquid fuels for sectors that are difficult to decarbonize are both a large market and a key piece of the decarbonization puzzle," Roberts wrote.</p>
<p>But turning carbon dioxide into a different molecule is typically both energy intensive and expensive because carbon dioxide is so stable, according to the Argonne National Laboratory: The new catalyst, however, is highly efficient.</p><p>The lab explained how it works:</p><blockquote>The team's catalyst consists of atomically dispersed copper on a carbon-powder support. By an electrochemical reaction, this catalyst breaks down CO2 and water molecules and selectively reassembles the broken molecules into ethanol under an external electric field. The electrocatalytic selectivity, or "Faradaic efficiency," of the process is over 90 percent, much higher than any other reported process. What is more, the catalyst operates stably over extended operation at low voltage.</blockquote><p>Because the process can work at low pressures and temperatures, it can be paired with renewable energy technologies. This is because it will be able to stop and restart easily in response to a changing power supply.</p><p>"We could couple the electrochemical process of CO2-to-ethanol conversion using our catalyst to the electric grid and take advantage of the low-cost electricity available from renewable sources like <a href="https://www.ecowatch.com/tag/solar-energy" target="_self">solar</a> and <a href="https://www.ecowatch.com/tag/wind" target="_self">wind</a> during off-peak hours," Liu said.</p>
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Modern Medical Techniques Reveal Malignant Cancer in 77-Million Year-Old Dinosaur Bone
07 August
Science
Centrosaurus apertus was a plant-eating, single-horned dinosaur that lived 76 to 77 million years ago. Sergey Krasovskiy / Stocktrek Images / Getty Images
Scientists have discovered and diagnosed the first instance of malignant cancer in a dinosaur, and they did so by using modern medical techniques. They published their results earlier this week in The Lancet Oncology.
<p>In 1989, a badly-deformed lower leg bone of a <em>Centrosaurus apertus</em> was found in Dinosaur Provincial Park in Alberta, Canada. One end of the fossilized fibula was enlarged and warped, leading scientists to originally presume a healed fracture.</p><p><em>Centrosaurus apertus</em> was a plant-eating, single-horned dinosaur about 20 feet long. The particular animal that the fossil comes from lived 76 to 77 million years ago and likely died in a flood that killed its entire herd.</p>
<p>After the bone was excavated, it sat in a museum until 2017, when a team led by David Evans, a paleontologist at the Royal Ontario Museum, and Mark Crowther, a professor of pathology at McMaster University, looked at it with fresh eyes.</p><p>"We basically went on a hunt for dinosaur cancer," Evans told <a href="https://www.npr.org/2020/08/04/899060875/scientists-discover-malignant-cancer-in-a-dinosaur" target="_blank">NPR</a>.</p><p>On a mission to find signs of cancer, the scientists searched through hundreds of injured or partially healed fossils before they found the malformed leg bone. The team invited multidisciplinary specialists and medical professionals from many fields, including pathology, radiology, orthopedic surgery and paleopathology, to help diagnose the suspected tumor, the news report said.</p>
<p>"The approach we took in this case was very similar to how we approach a patient that comes in with a new tumor, and we don't know what kind of tumor it is," said Seper Ekhtiari, an orthopedic surgery resident on the team, reported NPR.</p><p>The team performed high-resolution CT scans and examined thin sections of bone cells under a microscope, according to a <a href="https://www.rom.on.ca/en/about-us/newsroom/press-releases/rare-malignant-cancer-diagnosed-in-a-dinosaur" target="_blank">Royal Ontario Museum (ROM) press release</a>. This allowed them to visualize the progression of cancer through the bone, discounting the initial hypothesis of a fracture and leading to the diagnosis of osteosarcoma, Evans told <a href="https://www.reuters.com/article/us-science-dinosaur-cancer/gnarly-tumor-shows-dinosaurs-got-cancer-too-idUSKCN24Z2QU" target="_blank">Reuters</a>.</p><p>Osteosarcoma generally occurs in rapidly growing bones, and is found in children and young adults, said Mark Crowther, the study's co-author and a professor of medicine, pathology and molecular medicine, Reuters reported. The tumor destroys the bone and can spread to other tissues. Dinosaurs presumably would also be at risk because they grew at enormous rates, he added.</p>
<p>"One of the ways they got to such massive sizes is that they grew extremely rapidly from the time when they were born," Ekhtiari told <a href="https://www.npr.org/2020/08/04/899060875/scientists-discover-malignant-cancer-in-a-dinosaur" target="_blank">NPR</a>. "So finding this in a dinosaur is not surprising." He also noted that bone cancer "is probably more common than we think, or more common than we have found so far."</p><p>The findings suggest that dinosaurs likely suffered from other diseases that affect bones, like tuberculosis and osteomyelitis, Crowther said, NPR reported.</p><p>To confirm the diagnosis, the scientists compared the fossil to a healthy <em>centrosaurus </em>fibula as well as to a human fibula confirmed with osteosarcoma, the <a href="https://www.rom.on.ca/en/about-us/newsroom/press-releases/rare-malignant-cancer-diagnosed-in-a-dinosaur" target="_blank">ROM release</a> explained.</p>
<p>"It is both fascinating and inspiring to see a similar multidisciplinary effort that we use in diagnosing and treating osteosarcoma in our patients leading to the first diagnosis of osteosarcoma in a dinosaur," Ekhtiari said in the ROM release. "This discovery reminds us of the common biological links throughout the animal kingdom and reinforces the theory that osteosarcoma tends to affect bones when and where they are growing most rapidly."</p><p>Evans, an expert on <em>centrosaurus</em>, told <a href="https://www.npr.org/2020/08/04/899060875/scientists-discover-malignant-cancer-in-a-dinosaur" target="_blank">NPR</a>, "We often think of dinosaurs as sort of mythical, powerful creatures, and I think this discovery really underscores that they can be afflicted by diseases that we see around us today, even horrible fatal cancers. I think in an odd way it brings them even more back to life."</p>
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Saturn's moon, Enceladus, is one of three moons that appear to contain subsurface oceans underneath an icy shell. Marc Van Norden / NASA / Flickr / CC by 2.0
By Zulfikar Abbany
"We don't have a definition of life," says Kevin Peter Hand, one early California morning when we speak via video. "We don't actually know what life is."
<p>He says that in between sips of coffee, as though it were perfectly obvious.</p><p>But scientists must really get bored — even annoyed — by journalists repeatedly asking how their fundamental research in space can be applied in the <em>real world</em>. It is a question worth asking, however. Especially when they tell you that they are looking for a "second origin of life." You just have to ask why.</p><p>Fortunately, Hand, who heads NASA's Ocean Worlds Lab, is charming and gentle as he explains his fascination with what he calls "alien oceans" both on Earth and on distant water worlds, like Jupiter's moon, Europa, Saturn's moon, Enceladus, or Triton, a "bizarre" object that rotates in the opposite direction from its host planet, Neptune.</p>
<img lazy-loadable="true" src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzUzNTU2Ni9vcmlnaW4ucG5nIiwiZXhwaXJlc19hdCI6MTYwNDk1NzcyMX0.iIJrx-5xjFFb_3D22H6P3AN4v3MvX87hBZa-sJzIIKI/img.png?width=980" id="7198f" class="rm-shortcode" data-rm-shortcode-id="946767de5696a09fc34090e5ade96142" data-rm-shortcode-name="rebelmouse-image" /><p>"We have numerous hypotheses for how life originated on Earth," says Hand. "For instance, it may have originated in the hydrothermal vents of our ocean, or in warm tide pools on the continents of an ancient Earth, or perhaps it originated from spark discharge from lightning in the atmosphere and precipitating organic compounds glued together to form life… But nothing has so far crawled out of the lab."</p>
Alien Oceans Here and There
<p>Europa, Enceladus, and Triton are just three of over 200 moons in our solar system. But they are special moons. They seem to have live, liquid water environments below the surface — also known as subsurface oceans — under an icy shell.</p><p>"These are global liquid oceans covered with ice," says Hand. "And if we go to Europa or Enceladus, these worlds where hydrothermal vents could exist, but where no continents exist, and there's no atmosphere, and if we found life, that would almost certainly point to an origin of life in hydrothermal vents."</p><p>And that may then tell us more about life on Earth. </p><p>Hydrothermal vents are found at extreme depths of around 6,000 kilometers (3,728 miles) in vast trenches below the surface of Earth's own ocean.</p><p>Not so long ago, those trenches were believed to be too dark for any life to exist. But through oceanographic research and commercial prospectors trawling for rare minerals like manganese nodules, we now know that hydrothermal vents are teeming with microbial life. So, the same may be true on a distant moon.</p><p>"That's not to say we'd be able to cross off the potential for the origin of life in tide pools on ancient Earth, but if we found life in hydrothermal vents on these moons, we would at least have another data point," says Hand.</p>Biology Beyond Earth
<p>Biology — or organic life as we know it — is perhaps the final piece in a jigsaw puzzle for space scientists.</p><p>Thanks to Galileo, says Hand, we know that the laws of physics work beyond Earth. So, too, with the principles of chemistry and geology.</p><p>"But we don't know whether this phenomenon called life has happened a second, independent time from life here on Earth. And that's why the question of a second origin of life is so compelling," says Hand.</p><img lazy-loadable="true" src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzUzNTYxNy9vcmlnaW4ucG5nIiwiZXhwaXJlc19hdCI6MTU5OTc0MzIyMX0.qE2ydg5bNdxr2x0-ALNyOPM3K8iOTQzPp1cdbbtikoc/img.png?width=980" id="a389a" class="rm-shortcode" data-rm-shortcode-id="720a25ec63df8ccb03462e1f5752f8f3" data-rm-shortcode-name="rebelmouse-image" /><p>And it's vital that that second origin of life is discovered — if at all — on planets, moons and other celestial bodies deep in the solar system, bodies that are too far away for any Earthly life to have reached or "contaminated" what may, or may not, be there.</p><p>"It would be hard for an Earth rock to get out there with Earth microbes and seed those oceans with DNA-based life," says Hand. "So, if we find life on these worlds, they will represent a separate, independent origin of life and, as such, that will tell us about the diversity of life, not just in our solar system, but in the universe as a whole."</p>
The Europa Clipper
<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="367f258c4634fbd67ad3ce7ef3a73b5f"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/GqTaDCt_F1Y?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span><p>Hand's focus for now is Jupiter's moon, Europa. One of his current projects is the <a href="https://www.jpl.nasa.gov/missions/europa-clipper/" target="_blank">Europa Clipper</a> mission, which will perform about 45 so-called "flybys" of the moon. </p><p>Its launch date has yet to be decided. But the plan is for the Europa Clipper to take hi-resolution images of the moon's surface on a scale of between 50 centimeters per pixel and tens of meters per pixel.</p><p>It will look for organics, like salt.</p><p>It will have an ice penetrating radar onboard, and spectrometers that could "taste" any plumes erupting out of Europa.</p><p>"It will fly through the plumes and capture some of that material so we can analyze it directly. That will be phenomenal, but it won't get us down to the surface," says Hand. So, they are working on another mission that would land on Europa, too.</p>Trident for Triton
<p>Meanwhile, NASA's <a href="https://www.nasa.gov/press-release/nasa-selects-four-possible-missions-to-study-the-secrets-of-the-solar-system" target="_blank">Discovery Program</a> has two further outer solar system moon missions under consideration. One of those missions is called Trident. And if it's selected to move forward, the mission will investigate Neptune's moon, Triton.</p><p>Trident would launch in 2026 for a 12-year journey to Triton. The last spacecraft to study Triton was Voyager 2, which launched in 1977. It got to within 40,000 km of Triton, whereas Trident would get as close as 500 km on two flybys.</p><p>"Voyager gave us pictures that let us see geysers and plumes on Triton and that was 30 years ago — 50 years before Trident," says Yohai Kaspi, a professor of atmospheric dynamics and planetary science at the Weizmann Institute in Israel. "But with today's technology and imaging, we can do much better."</p><p>Kaspi and his colleagues are contributing a special clock to the project, with which they hope to measure the density and temperature of Triton's atmosphere.</p><p>The clock is called an Ultra-Stable Oscillator (USO).</p><p>It's a basically quartz clock, like a quartz wristwatch, but it's kept it at a very stable temperature to protect it from all the temperature variations in space.</p><p>"You hold it in a little oven, literally a tiny oven, with a stable temperature of one milliKelvin," says Kaspi, "and that gives us an accurate time frequency."</p><p>The spacecraft will have a radio link to Earth for the purpose of Kaspi's experiment and for general use, such as navigation. It will be a constant signal.</p><p>But the speed at which that signal travels back to Earth will change as the spacecraft enters and moves through Triton's atmosphere. The atmosphere is almost a filter through which the signal will have to pass. Measuring and comparing the difference in time it takes the signal to travel to Earth will allow scientists to measure thickness of Triton's atmosphere and build a profile of the moon's atmospheric temperature.</p>How Do Moon Oceans and Their Atmospheres Interact?
<p>Kaspi says Triton's atmosphere makes it unique. "Enceladus is too small to have an atmosphere and Europa barely has an atmosphere," he says. "Triton's atmosphere is not as dense as the one on Earth but it's enough of an atmosphere to transport material around. And in addition to that, it's likely that Triton was not even formed in our solar system. So, it's a real opportunity."</p><p>If the mission goes ahead, it may also be an opportunity to understand more about the interaction between subsurface oceans, or the "interior" of such moons, and their atmospheres. Because atmospheres are just as important for maintaining life and water is for originating life.</p><p>"We see these plumes coming from the interior, and they are then transported by the atmosphere. We see these active geysers and then these streaks on the planet, and they're all in the same direction," Kaspi says. "So, you would assume that there is a wind going from one side to the other. Voyager observed that. But that is about as much as we know."</p><p>What we don't know, says Kaspi, is how much of Triton's atmosphere originated from the interior, or whether the subterranean ocean can communicate or interact much with the outside.</p><p>The instruments on Trident are designed to find out how the whole system works together. They may even get us a little closer to that elusive definition of life itself.</p><p>"I hope that maybe 400 years from now our descendants will be able to point to innovations and discoveries that we made and go, 'Wow, can you believe they argued about the importance of searching for life beyond Earth and its application?'" says NASA's Kevin Hand.</p><p>"And perhaps they will be able to laugh about that in the same way that we look at Galileo and say: 'Of course, Galileo's work was pivotal in changing the way we think about the universe' — and everything that cascades from that, right down to the computer conversation that we're having now."</p><p>Message received.</p>
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A whale shark swims in the Egyptian Red Sea. Derek Keats / Wikimedia Commons / CC by 2.0
By Gavin Naylor
Sharks elicit outsized fear, even though the risk of a shark bite is infinitesimally small. As a marine biologist and director of the Florida Program for Shark Research, I oversee the International Shark Attack File – a global record of reported shark bites that has been maintained continuously since 1958.
<p>We are careful to emphasize how rare shark bites are: You are 30 times more likely to be struck by lightning than be bitten by a shark. You are more likely to die while <a href="https://theconversation.com/why-do-people-risk-their-lives-for-the-perfect-selfie-55937" target="_blank">taking a selfie</a>, or be <a href="https://www.floridamuseum.ufl.edu/shark-attacks/odds/compare-risk/nyc-biting-injuries/" target="_blank">bitten by a New Yorker</a>. In anticipation of the anxiety that's typically generated by the Discovery Channel's <a href="https://www.discovery.com/shark-week/2019/s/shark-week-announcement-2019" target="_blank">Shark Week programming</a>, here are a few things about sharks that are often overlooked.</p>
<blockquote class="instagram-media" data-instgrm-captioned data-instgrm-permalink="https://www.instagram.com/p/Bz_foeEj4D0/?utm_source=ig_embed&utm_campaign=loading" data-instgrm-version="12" style=" background:#FFF; border:0; border-radius:3px; box-shadow:0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width:540px; min-width:326px; padding:0; width:99.375%; width:-webkit-calc(100% - 2px); width:calc(100% - 2px);"><div style="padding:16px;"> <a href="https://www.instagram.com/p/Bz_foeEj4D0/?utm_source=ig_embed&utm_campaign=loading" style=" background:#FFFFFF; line-height:0; padding:0 0; text-align:center; text-decoration:none; width:100%;" target="_blank"> <div style=" display: flex; flex-direction: row; align-items: center;"> <div style="background-color: #F4F4F4; border-radius: 50%; flex-grow: 0; height: 40px; margin-right: 14px; width: 40px;"></div> <div style="display: flex; flex-direction: column; flex-grow: 1; justify-content: center;"> <div style=" background-color: #F4F4F4; border-radius: 4px; flex-grow: 0; height: 14px; margin-bottom: 6px; width: 100px;"></div> <div style=" background-color: #F4F4F4; border-radius: 4px; flex-grow: 0; height: 14px; width: 60px;"></div></div></div><div style="padding: 19% 0;"></div> <div style="display:block; height:50px; margin:0 auto 12px; width:50px;"><svg width="50px" height="50px" viewBox="0 0 60 60" version="1.1" xmlns="https://www.w3.org/2000/svg" xmlns:xlink="https://www.w3.org/1999/xlink"><g stroke="none" stroke-width="1" fill="none" fill-rule="evenodd"><g transform="translate(-511.000000, -20.000000)" fill="#000000"><g><path d="M556.869,30.41 C554.814,30.41 553.148,32.076 553.148,34.131 C553.148,36.186 554.814,37.852 556.869,37.852 C558.924,37.852 560.59,36.186 560.59,34.131 C560.59,32.076 558.924,30.41 556.869,30.41 M541,60.657 C535.114,60.657 530.342,55.887 530.342,50 C530.342,44.114 535.114,39.342 541,39.342 C546.887,39.342 551.658,44.114 551.658,50 C551.658,55.887 546.887,60.657 541,60.657 M541,33.886 C532.1,33.886 524.886,41.1 524.886,50 C524.886,58.899 532.1,66.113 541,66.113 C549.9,66.113 557.115,58.899 557.115,50 C557.115,41.1 549.9,33.886 541,33.886 M565.378,62.101 C565.244,65.022 564.756,66.606 564.346,67.663 C563.803,69.06 563.154,70.057 562.106,71.106 C561.058,72.155 560.06,72.803 558.662,73.347 C557.607,73.757 556.021,74.244 553.102,74.378 C549.944,74.521 548.997,74.552 541,74.552 C533.003,74.552 532.056,74.521 528.898,74.378 C525.979,74.244 524.393,73.757 523.338,73.347 C521.94,72.803 520.942,72.155 519.894,71.106 C518.846,70.057 518.197,69.06 517.654,67.663 C517.244,66.606 516.755,65.022 516.623,62.101 C516.479,58.943 516.448,57.996 516.448,50 C516.448,42.003 516.479,41.056 516.623,37.899 C516.755,34.978 517.244,33.391 517.654,32.338 C518.197,30.938 518.846,29.942 519.894,28.894 C520.942,27.846 521.94,27.196 523.338,26.654 C524.393,26.244 525.979,25.756 528.898,25.623 C532.057,25.479 533.004,25.448 541,25.448 C548.997,25.448 549.943,25.479 553.102,25.623 C556.021,25.756 557.607,26.244 558.662,26.654 C560.06,27.196 561.058,27.846 562.106,28.894 C563.154,29.942 563.803,30.938 564.346,32.338 C564.756,33.391 565.244,34.978 565.378,37.899 C565.522,41.056 565.552,42.003 565.552,50 C565.552,57.996 565.522,58.943 565.378,62.101 M570.82,37.631 C570.674,34.438 570.167,32.258 569.425,30.349 C568.659,28.377 567.633,26.702 565.965,25.035 C564.297,23.368 562.623,22.342 560.652,21.575 C558.743,20.834 556.562,20.326 553.369,20.18 C550.169,20.033 549.148,20 541,20 C532.853,20 531.831,20.033 528.631,20.18 C525.438,20.326 523.257,20.834 521.349,21.575 C519.376,22.342 517.703,23.368 516.035,25.035 C514.368,26.702 513.342,28.377 512.574,30.349 C511.834,32.258 511.326,34.438 511.181,37.631 C511.035,40.831 511,41.851 511,50 C511,58.147 511.035,59.17 511.181,62.369 C511.326,65.562 511.834,67.743 512.574,69.651 C513.342,71.625 514.368,73.296 516.035,74.965 C517.703,76.634 519.376,77.658 521.349,78.425 C523.257,79.167 525.438,79.673 528.631,79.82 C531.831,79.965 532.853,80.001 541,80.001 C549.148,80.001 550.169,79.965 553.369,79.82 C556.562,79.673 558.743,79.167 560.652,78.425 C562.623,77.658 564.297,76.634 565.965,74.965 C567.633,73.296 568.659,71.625 569.425,69.651 C570.167,67.743 570.674,65.562 570.82,62.369 C570.966,59.17 571,58.147 571,50 C571,41.851 570.966,40.831 570.82,37.631"></path></g></g></g></svg></div><div style="padding-top: 8px;"> <div style=" color:#3897f0; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:550; line-height:18px;"> View this post on Instagram</div></div><div style="padding: 12.5% 0;"></div> <div style="display: flex; flex-direction: row; margin-bottom: 14px; align-items: center;"><div> <div style="background-color: #F4F4F4; border-radius: 50%; height: 12.5px; width: 12.5px; transform: translateX(0px) translateY(7px);"></div> <div style="background-color: #F4F4F4; height: 12.5px; transform: rotate(-45deg) translateX(3px) translateY(1px); width: 12.5px; flex-grow: 0; margin-right: 14px; margin-left: 2px;"></div> <div style="background-color: #F4F4F4; border-radius: 50%; height: 12.5px; width: 12.5px; transform: translateX(9px) translateY(-18px);"></div></div><div style="margin-left: 8px;"> <div style=" background-color: #F4F4F4; border-radius: 50%; flex-grow: 0; height: 20px; width: 20px;"></div> <div style=" width: 0; height: 0; border-top: 2px solid transparent; border-left: 6px solid #f4f4f4; border-bottom: 2px solid transparent; transform: translateX(16px) translateY(-4px) rotate(30deg)"></div></div><div style="margin-left: auto;"> <div style=" width: 0px; border-top: 8px solid #F4F4F4; border-right: 8px solid transparent; transform: translateY(16px);"></div> <div style=" background-color: #F4F4F4; flex-grow: 0; height: 12px; width: 16px; transform: translateY(-4px);"></div> <div style=" width: 0; height: 0; border-top: 8px solid #F4F4F4; border-left: 8px solid transparent; transform: translateY(-4px) translateX(8px);"></div></div></div></a> <p style=" margin:8px 0 0 0; padding:0 4px;"> <a href="https://www.instagram.com/p/Bz_foeEj4D0/?utm_source=ig_embed&utm_campaign=loading" style=" color:#000; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px; text-decoration:none; word-wrap:break-word;" target="_blank">Dr. Greg Skomal, of @massmarinefisheries, working with the Atlantic White Shark Conservancy, tagged 4 sharks today off Wellfleet and Truro, bringing the total tagged this season to 12.</a></p> <p style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; line-height:17px; margin-bottom:0; margin-top:8px; overflow:hidden; padding:8px 0 7px; text-align:center; text-overflow:ellipsis; white-space:nowrap;">A post shared by <a href="https://www.instagram.com/a_whiteshark/?utm_source=ig_embed&utm_campaign=loading" style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px;" target="_blank"> Atlantic White Shark Cons.</a> (@a_whiteshark) on <time style=" font-family:Arial,sans-serif; font-size:14px; line-height:17px;" datetime="2019-07-16T21:05:54+00:00">Jul 16, 2019 at 2:05pm PDT</time></p></div></blockquote> <script async src="//www.instagram.com/embed.js"></script>
A Big, Diverse Family
<p>Not all sharks are the same. Only a dozen or so of the roughly 520 shark species pose any risk to people. Even the three species that account for almost all shark bite fatalities – the <a href="https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/carcharodon-carcharias/" target="_blank">white shark</a> (<em>Carcharodon carcharias</em>), <a href="https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/galeocerdo-cuvier/" target="_blank">tiger shark</a> (<em>Galeocerdo cuvier</em>) and <a href="https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/carcharhinus-leucas/" target="_blank">bull shark</a> (<em>Carcharhinus leucas</em>) – are behaviorally and evolutionarily very different from one another.</p><p>The tiger shark and bull shark are genetically as different from each other as a dog is from a rabbit. And both of these species are about as different from a white shark as a dog is from a kangaroo. The evolutionary lineages leading to the two groups split 170 million years ago, during the age of dinosaurs and before the origin of birds, and <a href="https://www.ck12.org/book/CK-12-Human-Biology/section/7.2/" target="_blank">110 million years before the origin of primates</a>.</p><img lazy-loadable="true" src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzUzMzc3OC9vcmlnaW4ucG5nIiwiZXhwaXJlc19hdCI6MTY1NTA0NjYyMX0.CGw2QD-PB_OK1hjp_qZxj-XUZxGCxY99hXS1IOdhoK4/img.png?width=980" id="2694f" class="rm-shortcode" data-rm-shortcode-id="48367745897fee27f4750d3fc43cc6d8" data-rm-shortcode-name="rebelmouse-image" />
White, tiger and bull sharks are distinct species that diverged genetically tens of millions of years ago. Gavin Naylor / CC BY-ND
<p>Yet many people assume all sharks are alike and equally likely to bite humans. Consider the term "shark attack," which is scientifically equivalent to "mammal attack." Nobody would equate dog bites with hamster bites, but this is exactly what we do when it comes to sharks.</p><p>So, when a reporter calls me about a fatality caused by a white shark off Cape Cod and asks my advice for beachgoers in North Carolina, it's essentially like asking, "A man was killed by a dog on Cape Cod. What precautions should people take when dealing with kangaroos in North Carolina?"</p>Know Your Species
<p>Understanding local species' behavior and life habits is one of the best ways to stay safe. For example, almost all shark bites that occur off Cape Cod are by white sharks, which are a large, primarily cold-water species that spend most of their time in isolation feeding on fishes. But they also aggregate near seal colonies that provide a reliable food source at certain times of the year.</p><p>Shark bites in the Carolinas are by warm-water species like bull sharks, tiger sharks and <a href="https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/carcharhinus-limbatus/" target="_blank">blacktips</a> (<em>Carcharhinus limbatus</em>). Each species is associated with particular habitats and dietary preferences.</p><p>Blacktips, which we suspect are responsible for most relatively minor bites on humans in the southeastern United States, feed on schooling bait fishes like menhaden. In contrast, bull sharks are equally at home in fresh water and salt water, and are often found near estuaries. Their bites are more severe than those of blacktips, as they are larger, more powerful, bolder and more tenacious. Several fatalities have been ascribed to bull sharks.</p><p>Tiger sharks are also large, and are responsible for a significant fraction of fatalities, particularly off the coast of volcanic islands like Hawaii and Reunion. They are tropical animals that often venture into shallow water frequented by swimmers and surfers.</p><span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="1cfa1c9590e386ecc9455b4762b87518"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/yDqzGOa-adc?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span>
Humans Are Not Targets
<p>Sharks do not "hunt" humans. Data from the International Shark Attack File compiled over the past 60 years show a tight association between shark bites and the number of people in the water. In other words, shark bites are a simple function of the probability of encountering a shark.</p><p>This underscores the fact that shark bites are almost always cases of mistaken identity. If sharks actively hunted people, there would be many more bites, since humans make very easy targets when they swim in sharks' natural habitats.</p><p>Local conditions can also affect the risk of an attack. Encounters are more likely when sharks venture closer to shore, into areas where people are swimming. They may do this because they are following bait fishes or seals upon which they prey.</p><p>This means we can use environmental variables such as temperature, tide or weather conditions to better predict movement of bait fish toward the shoreline, which in turn will predict the presence of sharks. Over the next few years, the Florida Program for Shark Research will work with colleagues at other universities to monitor onshore and offshore movements of tagged sharks and their association with environmental variables so that we can improve our understanding of what conditions bring sharks close to shore.</p>More to Know
<p>There still is much to learn about sharks, especially the 500 or so species that have never been implicated in a bite on humans. One example is the tiny <a href="https://www.newsweek.com/one-worlds-rarest-sharks-also-one-most-adorable-325280" target="_blank">deep sea pocket shark</a>, which has a strange pouch behind its pectoral fins.</p><p>Only two specimens of this type of shark have ever been caught – one off the coast of Chile 30 years ago, and another more recently in the Gulf of Mexico. We're not sure about the function of the pouch, but suspect it stores luminous fluid that is released to distract would-be predators – much as its close relative, the <a href="https://sharkdevocean.wordpress.com/2015/04/23/second-ever-pocket-shark-discovered-in-gulf-of-mexico/" target="_blank">tail light shark</a>, releases luminous fluid from a gland on its underside near its vent.</p><span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="5783b39d0838d6e410344a852ed0dcc3"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/UTO5debfmsg?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span><p>Sharks range in form from the bizarre <a href="https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/mitsukurina-owstoni/" target="_blank">goblin shark</a> (<em>Mitsukurina owstoni</em>), most commonly encountered in Japan, to the gentle filter-feeding <a href="https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/rhincodon-typus/" target="_blank">whale shark</a> (<em>Rhincodon typus</em>). Although whale sharks are the largest fishes in the world, we have yet to locate their nursery grounds, which are likely teeming with thousands of <a href="https://www.earthtouchnews.com/oceans/sharks/baby-whale-shark-rescued-from-gillnet-in-india-video/" target="_blank">foot-long pups</a>. Some deepwater sharks are primarily known from submersibles, such as the giant <a href="https://twitter.com/gavinnaylor/status/1146144452681113601" target="_blank">sixgill shark</a>, which feeds mainly on carrion but probably also preys on other animals in the deep sea.</p><p>Sharks seem familiar to almost all of us, but we know precious little about them. Our current understanding of their biology barely scratches the surface. The little we do know suggests they are profoundly different from other vertebrate animals. They've had 400 million years of independent evolution to adapt to their environments, and it's reasonable to expect they may be hiding more than a few tricks up their gills.</p>
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Scientists say it will take a massive amount of collective action to reverse deforestation and save society from collapse. Big Cheese Photo / Getty Images Plus
Deforestation coupled with the rampant destruction of natural resources will soon have devastating effects on the future of society as we know it, according to two theoretical physicists who study complex systems and have concluded that greed has put us on a path to irreversible collapse within the next two to four decades, as VICE reported.
<p>The research by the two physicists, one from Chile and the other from the UK, was published last week in<em> <a href="https://www.nature.com/articles/s41598-020-63657-6" target="_blank">Nature Scientific Reports</a></em>. The researchers used advance statistical modeling to look at how a growing human population can cope with the loss of resources, mainly due to deforestation. After crunching the numbers, the scientists came up with a fairly bleak assessment of society's chance of surviving the <a href="https://www.ecowatch.com/tag/climate-crisis" target="_self">climate crisis</a>.</p><p>"Based on the current resource consumption rates and best estimate of technological rate growth our study shows that we have very low probability, less than 10 percent in most optimistic estimate, to survive without facing a catastrophic collapse," the authors write in the <a href="https://www.nature.com/articles/s41598-020-63657-6" target="_blank">study</a> abstract.</p>
<p>From all the issues that the climate crisis raises like rising sea levels, increases in extreme weather, drought, flooding, and crop failures, scientists zeroed in on deforestation since it is more measurable right now. They argue that forest density, or its current scarcity, is considered the cataclysmic canary in the coal mine, according to the report, as <a href="https://nypost.com/2020/07/29/humanity-likely-faces-rapid-catastrophic-collapse-study-warns/" target="_blank">The New York Post</a> reported.</p><p>"Many factors due to human activity are considered as possibly responsible for the observed changes: among these water and air contamination (mostly greenhouse effect) and deforestation are the most cited. While the extent of human contribution to the greenhouse effect and temperature changes is still a matter of discussion, the deforestation is an undeniable fact," the authors write.</p>
<p>The authors note that the current rate of deforestation would mean that all <a href="https://www.ecowatch.com/tag/forests">forests</a> would disappear within 100-200 years.</p><p>"Clearly it is unrealistic to imagine that the human society would start to be affected by the deforestation only when the last tree would be cut down," the authors write, as the <a href="https://www.dailymail.co.uk/news/article-8571787/Human-civilization-stands-90-chance-collapse-decades-physicists-claim.html" target="_blank">Daily Mail</a> reported.</p><p>The trajectory of such rapid resource use to supply a rapidly growing human population would result in the loss of planetary life-support systems necessary for human survival, including carbon storage, oxygen production, soil conservation and water cycle regulation, according to the Daily Mail.</p><p>In the absence of these critical services, "it is highly unlikely to imagine the survival of many species, including ours, on Earth without [forests]" the study points out. "The progressive degradation of the environment due to deforestation would heavily affect human society and consequently the human collapse would start much earlier," they write, as VICE reported.</p>
<p>The numbers the researchers look at highlight the extent of human greed. Prior to human civilizations, the earth was covered by 60 million square kilometers of forest. As deforestation has ramped up, the new paper points out that there are now less than 40 million square kilometers of forest remaining.</p><p>"Calculations show that, maintaining the actual rate of population growth and resource consumption, in particular forest consumption, we have a few decades left before an irreversible collapse of our civilization," the paper concludes, as VICE reported.</p>
<p>The model developed by the physicists depicts human population growth reaching a maximum level that is undermined by the shrinking of forests, which will not have enough resources left to sustain people. After this point, "a rapid disastrous collapse in population occurs before eventually reaching a low population steady state or total extinction … We call this point in time the 'no-return point' because if the deforestation rate is not changed before this time the human population will not be able to sustain itself and a disastrous collapse or even extinction will occur," the authors write, according to VICE.</p><p>Of course, as with every theoretical paper, there are limitations. The paper assumes that some measurements (such as population growth and deforestation rate) will remain constant, which is certainly not guaranteed. Forest is also taken as a proxy for all resources, which could be seen as too simplistic, as <a href="https://www.iflscience.com/environment/chances-of-societal-collapse-in-next-few-decades-is-sky-high-modelling-suggests/" target="_blank">IFLScience</a> noted.</p><p>The authors point out that it will take a massive amount of collective action to reverse direction and save our society from collapse.</p>
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Researchers have turned to hydrophones, instruments that use underwater microphones to gather data beyond the reach of any camera or satellite. Pxfuel
By Kristen Pope
Melting and crumbling glaciers are largely responsible for rising sea levels, so learning more about how glaciers shrink is vital to those who hope to save coastal cities and preserve wildlife.
<p>But it is hard to get good pictures and measurements because glaciers typically are in remote, difficult-to-reach, and even dangerous locations. Satellites are often used to measure glacial retreat, but these images are far from complete, especially when it's cloudy, foggy, raining, or snowing.</p><p>So researchers have turned to hydrophones, instruments that use underwater microphones to gather data beyond the reach of any camera or satellite. Hydrophones can record underwater in all conditions. Originally used by the military to detect submarines, hydrophones are now one more tool scientists have to learn about climate change. The devices collect data continuously and they are relatively inexpensive and easy to deploy and maintain in many different areas of the world to monitor sea ice, underwater earthquakes, ship noise, and even wildlife patterns.</p>
Groans, Creaks, Icebergs’ Calving Splashes
<p>Oskar Glowacki already knew that melting glacial ice sounds like frying bacon. As ice bubbles burst, anyone nearby can hear crackling and popping, said Glowacki, a postdoctoral scholar at the Scripps Institution of Oceanography. Using hydrophones, he and other scientists now can make more nuanced measurements of how a changing climate sounds underwater, from the groans, creaks and splashes of a calving iceberg to the changes in whale songs as the ocean warms.</p><p>Glowacki recently used a pair of hydrophones to study the underwater world of glaciers, publishing his findings in <a href="https://www.the-cryosphere.net/14/1025/2020/" target="_blank">The Cryosphere</a>. He and co-author Grant B. Deane measured glacier retreat by <a href="https://yaleclimateconnections.org/2020/07/melting-glaciers-sound-like-frying-bacon/" target="_blank">recording the sounds of ice</a> – from small chunks to enormous slabs – falling off the glacier and splashing into the water.</p><p>During the summer of 2016, Glowacki's team placed two hydrophones near Hansbreen Glacier in Hornsund Fjord, Svalbard. For a month and a half, they recorded sounds, also using three time-lapse cameras to collect images – including the "drop height" (how far the ice fell into the water) – so they could compare photos to the recordings. The team created a formula to represent the relationship between the size of a piece of ice falling from a glacier and the sound it makes underwater, also accounting for the pieces of ice falling from varying heights. (Hear an example of the sound an iceberg makes while calving <a href="https://soundcloud.com/user-248456662/iceberg-calving-hansbreen-glacier" target="_blank">here</a>.)</p><p>"Iceberg calving, defined as mechanical loss of ice from the edges of glaciers and ice shelves, is thought to be one of the most important components of the total ice loss," they note in their paper. They mention also that 32-40% of the Greenland ice sheet's mass loss is from solid ice discharge. However, Glowacki says it isn't just one process leading to glaciers losing mass: Surface melt, calving, and under-sea melting are all contributing factors.</p><p>Satellites are often used to measure glacial retreat, but the images they provide don't present a complete picture, and Glowacki and other scientists say they hope hydrophones can help provide more answers. Given that glaciers are typically remote and difficult to reach, collecting data remotely is key. Hydrophones, on the other hand, can record underwater in all these conditions.</p><p>Hydrophones also collect acoustic data and smaller events hard to find from a satellite image. "In a single day, [you] can have 100 or 200 icebergs breaking off from a single glacier," Glowacki says.</p><p>Glowacki says he and his team plan to further study iceberg calving, including studying additional glaciers, and collecting data for longer periods of time.</p>
Unlocking Information About Antarctic Ice Shelf
<p>Other researchers also are using hydrophones to learn more about crumbling glaciers. Bob Dziak, research oceanographer with the NOAA/Pacific Marine Environmental Laboratory <a href="https://www.pmel.noaa.gov/acoustics" target="_blank">acoustics research group</a>, captured a massive calving event of the Nansen Ice Shelf in Antarctica with a hydrophone. He published the results with colleagues in <a href="https://www.frontiersin.org/articles/10.3389/feart.2019.00183/full" target="_blank">Frontiers in Earth Science</a></p><p>On April 7, 2016, satellite images showed a massive calving event had occurred on the ice shelf. The paper described it as the "first large scale calving event in >30 years."</p><p>However, once Dziak and colleagues delved into the data from three hydrophones deployed 60 kilometers east of the ice shelf, they uncovered a series of "icequakes" from January to early March 2016. He and other researchers believe that much of the ice actually broke free in mid-January to February, but it remained in the same location until an April storm – which their paper described as the "largest low-pressure storm recorded in the previous seven months" – broke the ice free.</p><p>"We suspected that the icebergs broke apart but remained in place – kind of pinned in place – until a major storm with high winds passed through the area and, finally, it was that last push that pushed the icebergs out to sea," Dziak says.</p><p>He and his co-authors wrote that "fortuitous timing and proximity of the hydrophone deployment presented a rare opportunity to study cryogenic signals and ocean ambient sounds of a large-scale ice shelf calving and iceberg formation event."</p>Listening to Songs of Humpback Whales
<p><a href="https://www.mbari.org/" target="_blank">Monterey Bay Aquarium Research Institute</a> studies the ocean, including its acoustics. One of the institute's projects involves examining the soundscape of California's Monterey Bay, including sounds from animals, humans, weather, and geologic processes like earthquakes. The researchers once even recorded an under-sea landslide. They also focus on recording and analyzing the <a href="http://www.mbari.org/humpback-song/" target="_blank">songs of humpback whales</a>. Male humpback whales' songs can be over 15 minutes in length, and they can be repeated for long periods of time – even hours. Listening to these songs and analyzing them can provide unique insights into the lives of these complex animals.</p><p>"Any time we want to study marine mammals, sound gives us a window into their lives because they use sound for all of their essential life activities, really," says institute biological oceanographer John Ryan. "Communication, foraging, reproduction, navigation – depending on the species, of course."</p><p>Previously, scientists had thought singing occurred only during courtship and mating, but now they think whales may also use song while migrating and hunting. They know song has a crucial role in the whales' lives.</p><p>"There's a whole other dimension to humpback whale song," Ryan says. "It is a mode of cultural transmission in this species. They learn songs from each other. They share songs as a population, and when populations mix and mingle, they learn new ideas, they explore with their song, improvise, and it's a real essential part of their culture."</p><p>In 2015, institute researchers placed a hydrophone 3,000 feet deep, recording and analyzing humpback whale songs. Between 2015 and 2018, they collected over 26,000 hours of audio, which they used computer software to analyze. The researchers determined "peak singing season" in November through January, and they found most singing occurred at night. During peak season, songs were heard around 70% of the night.</p><p>However, from September 2015 to May 2016, they detected whales singing only about 11% of the time. Those months correlated with a period when the water temperature was especially high, depleting stocks of vital food sources like anchovies and krill, and correlating also with a toxic algal bloom. Scientists think the whales may have had to devote more time and energy to finding food, leaving less for singing. As researchers continue to study the worlds' oceans, they will undoubtedly learn more about underwater mysteries.</p><p>Listen to MBARI's live stream from beneath the bay <a href="https://www.mbari.org/soundscape-listening-room/" target="_blank">here</a>.</p>
<p><em>Reposted with permission from </em><em><a href="https://yaleclimateconnections.org/2020/07/hearing-the-under-sea-whispers-of-a-warming-climate/" target="_blank">Yale Climate Connections</a>.</em></p>
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The fact is, cats play different predatory roles in different natural and humanized landscapes. PIXNIO / CCO
By William S. Lynn, Arian Wallach and Francisco J. Santiago-Ávila
A number of conservationists claim cats are a zombie apocalypse for biodiversity that need to be removed from the outdoors by "any means necessary" – coded language for shooting, trapping and poisoning. Various media outlets have portrayed cats as murderous superpredators. Australia has even declared an official "war" against cats.
<p>Moral panics emerge when people perceive an existential threat to themselves, society or the environment. When in the grip of a <a href="https://www.thoughtco.com/moral-panic-3026420" target="_blank">moral panic</a>, the ability to think clearly and act responsibly is compromised. While the <a href="https://doi.org/10.1111/cobi.13346" target="_blank">moral panic over cats</a> arises from valid concerns over threats to native species, it obscures the real driver: humanity's exploitative treatment of the natural world. Crucially, errors of scientific reasoning also underwrite this false crisis.</p><h2>The (Shaky) Case Against Cats</h2><p><a href="https://doi.org/10.1002/fee.1633" target="_blank">Conservationists</a> and the <a href="https://www.nationalgeographic.com/animals/2019/09/essay-to-save-birds-should-we-kill-off-cats/" target="_blank">media</a> often claim that cats are a main contributor to a <a href="https://us.macmillan.com/books/9781250062185" target="_blank">mass extinction</a>, a catastrophic loss of species due to human activities, like habitat degradation and the killing of wildlife.</p><p>As an interdisciplinary team of scientists and ethicists studying animals in conservation, <a href="https://doi.org/10.1111/cobi.13346" target="_blank">we examined this claim</a> and found it wanting. It is true that like any other predator, cats can suppress the populations of their prey. Yet the extent of this effect is ecologically complex.</p><p>The potential impact of cats differs between <a href="https://doi.org/10.1016/j.biocon.2016.11.032" target="_blank">urban environments, small islands and remote deserts</a>. When <a href="https://doi.org/10.1371/journal.pone.0025970" target="_blank">humans denude regions of vegetation</a>, small animals are particularly at risk from cats because they have no shelter in which to hide.</p>
<p>Small animals are similarly vulnerable when humans kill apex predators that <a href="https://doi.org/10.1093/jmammal/gyv100" target="_blank">normally would suppress cat densities and activity</a>. For instance, in the U.S., cats are a <a href="https://www.smithsonianmag.com/smart-news/urban-coyotes-eat-lot-garbageand-cats-180974461/" target="_blank">favorite meal for urban coyotes</a>, who <a href="https://doi.org/10.1371/journal.pone.0075718" target="_blank">moderate feline impact</a>; and in Australia, <a href="https://doi.org/10.1111/j.1365-2664.2012.02207.x" target="_blank">dingoes hunt wild cats</a>, which relieves pressure on native small animals.</p><p>Add in contrary evidence and the case against cats gets even shakier. For instance, in some ecological contexts, <a href="https://www.livescience.com/2102-birds-glad-cats-eat-rats.html" target="_blank">cats contribute to the conservation of endangered birds</a>, by preying on <a href="https://doi.org/10.1046/j.1365-2656.1999.00285.x" target="_blank">rats and mice</a>. There are also <a href="https://doi.org/10.1071/WR19181" target="_blank">documented cases of coexistence</a> between cats and native prey species.</p><p>The fact is, cats play <a href="https://doi.org/10.1111/geb.12103" target="_blank">different predatory roles</a> in <a href="https://www.sciencemag.org/news/2013/08/australian-cats-and-foxes-may-not-deserve-their-bad-rep" target="_blank">different natural and humanized landscapes</a>. Scientists cannot assume that because cats are a problem for some wildlife in some places, they are a problem in every place.</p>
Faulty Scientific Reasoning
<p>In our <a href="https://doi.org/10.1111/cobi.13527" target="_blank">most recent publication</a> in the journal Conservation Biology, we examine an error of reasoning that props up the moral panic over cats.</p><p>Scientists do not simply collect data and analyze the results. They also establish a logical argument to explain what they observe. Thus, the reasoning behind a factual claim is equally important to the observations used to make that claim. And it is this reasoning about cats where claims about their threat to global biodiversity founder. In our analysis, we found it happens because many scientists take specific, local studies and overgeneralize those findings to the world at large.</p><p>Even when specific studies are good overall, projecting the combined "results" onto the world at large can cause unscientific overgeneralizations, particularly when <a href="https://doi.org/10.1016/j.tree.2015.01.003" target="_blank">ecological context is ignored</a>. It is akin to pulling a quote out of context and then assuming you understand its meaning.</p>Ways Forward
<p>So how might citizens and scientists chart a way forward to a more nuanced understanding of cat ecology and conservation?</p><p>First, those examining this issue on all sides can acknowledge that both the well-being of cats and the survival of threatened species are legitimate concerns.</p><p>Second, cats, like any other predator, affect their ecological communities. Whether that impact is good or bad is a complex value judgment, not a scientific fact.</p><p>Third, there is a need for a more rigorous approach to the study of cats. Such an approach must be mindful of the importance of ecological context and avoid the pitfalls of faulty reasoning. It also means resisting <a href="https://doi.org/10.1111/cobi.13126" target="_blank">the siren call of a silver (lethal) bullet</a>.</p><p>There is no one-size-fits-all solution. Yet there are many options to consider. Protecting apex predators and their habitat is fundamental to enabling <a href="https://theconversation.com/lets-give-feral-cats-their-citizenship-45165" target="_blank">threatened species to coexist with cats</a>. In some cases, people may choose to segregate domestic cats from vulnerable wildlife: for instance, with <a href="http://www.feralcats.com/catio/" target="_blank">catios</a> where cats can enjoy the outdoors while being kept apart from wildlife. In other cases, unhomed cats may be managed with <a href="https://www.animallaw.info/article/community-cats-changing-legal-paradigm-management-so-called-%22pests%22" target="_blank">trap-neuter-return programs</a> and <a href="https://www.lanaicatsanctuary.org/" target="_blank">sanctuaries</a>.</p><p>Finally, contrary to the framing of some scientists and journalists, the dispute over cats is not primarily about the science. Rather, it evokes an <a href="https://doi.org/10.1111/cobi.13494" target="_blank">ongoing debate</a> over the ethics that ought to guide humanity's relationship with other animals and nature.</p><p>This is the root of the moral panic over cats: the struggle to move beyond treating other beings with domination and control, toward fostering a relationship rooted in <a href="https://doi.org/10.1016/j.biocon.2020.108648" target="_blank">compassion and justice</a>.</p>
<p>
<em><a href="https://theconversation.com/profiles/william-s-lynn-182185" target="_blank">William S. Lynn</a> is a Research Scientist at Clark University.</em>
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<em><a href="https://theconversation.com/profiles/arian-wallach-120709" target="_blank">Arian Wallach</a> is a Lecturer at Centre for Compassionate Conservation, University of Technology Sydney.</em>
</p><p>
<em><a href="https://theconversation.com/profiles/francisco-j-santiago-avila-598733" target="_blank">Francisco J. Santiago-Ávila </a>is a Postdoctoral Researcher at University of Wisconsin-Madison.<br/>
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Disclosure statement: Arian Wallach receives funding from the Australian Research Council for research on cats, and from Alley Cat Allies for a workshop on cats in 2017. Francisco J. Santiago-Ávila and William S. Lynn do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.</em>
</p><p>
<em>Reposted with permission from <a href="https://theconversation.com/dont-blame-cats-for-destroying-wildlife-shaky-logic-is-leading-to-moral-panic-138710" target="_blank">The Conversation</a>.</em>
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Coastal Flooding Could Threaten Millions and Cost Trillions by 2100, New Study Finds
31 July
Climate
The last house to endure rising sea levels on Holland Island in the Chesapeake Bay off the coast of Maryland on May 23, 2010. The house collapsed in October 2010. baldeaglebluff / Flickr
The climate crisis may usher in a new level of global economic catastrophe and human suffering as extreme weather worsens and coastal flooding intensifies. A new study found that extreme weather will make coastal areas dangerous places to live as more intense storms crash into coast lines and increasingly high tides encroach inland, as The New York Times reported.
<p>"We are attempting to understand the magnitude of the global scale impacts of future coastal flooding," Ian Young, a professor at the University of Melbourne and an author of the study, <a href="https://www.cnbc.com/2020/07/30/climate-change-coastal-flooding-could-hit-20percent-of-gdp-by-2100.html" target="_blank">told CNBC</a>.</p><p>"Globally we need to understand that changes of this nature will occur by 2100 and we need to plan how we are going to respond," he said.</p><p>The <a href="https://www.nature.com/articles/s41598-020-67736-6" target="_blank">study</a>, published in <em>Scientific Reports,</em> found that the economic damage from those storms and from periodic flooding may cost over $14 trillion and threaten 20 percent of global gross domestic product, according to <a href="https://www.cnn.com/2020/07/30/weather/coastal-flooding-sea-level-rise-study-intl-hnk/index.html" target="_blank">CNN</a>.</p>
<p>"This is on a 'business as usual' CO2 emissions scenario," said Ebru Kirezci from the University of Melbourne, who led the study, as CNN reported. "Business as usual" assumes a rise in average global temperatures at the upper end of predictions, if global emissions are allowed to continue on their current course.</p><p>The study pinpointed exact hotspots around the world most vulnerable to coastal flooding, as well as the potential economic impact on infrastructure and activity in those areas. As Fortune noted, the study also maps out in great detail the impact of episodic flooding caused by strengthening storm events and tides. Those events are predicted to be more damaging than the threat of slowly <a href="http://www.ecowatch.com/tag/sea-level-rise" target="_self">rising seas</a> and will cause roughly 69 percent of coastal flooding by 2100.</p>
<p>Some of the regions that are particularly at risk, according to the study, are the following:</p><ul><li>The coasts of Northwest Europe, including Southeast England</li><li>The East Coast of the U.S., particularly the coasts of North Carolina, Virginia and Maryland</li><li>India, particularly around the Bay of Bengal</li></ul><p>The study was a collaboration between researchers from the University of Melbourne, IHE Delt in the Netherlands, the University of Amsterdam, the University of East Anglia in the UK, and Humboldt University in Berlin, Germany, as <a href="https://fortune.com/2020/07/30/coastal-flooding-gdp-impact/" target="_blank">Fortune</a> reported.</p>
<p>The authors also predict that the global population exposed to coastal flooding could be up to 287 million by 2100, which is 4.1 percent of the world's population, as <a href="https://www.usatoday.com/story/news/nation/2020/07/30/climate-change-coastal-flooding-cost-14-trillion-worldwide/5545712002/" target="_blank">USA TODAY</a> reported.</p><p>"What the data and our model is saying is that compared with now, what we see as a 1-in-100-year extreme flood event will be 10 times more frequent because of climate change," Kirezci said.</p><p>If the world's nations keep emitting greenhouse gases, and sea levels rise just 1 to 2 more feet, the amount of coastal land at risk of flooding would increase by roughly one-third, the research said.</p><p>"Even though average sea levels rise relatively slowly, we found that these other flooding risks like high tides, storm surge and breaking waves will become much more frequent and more intense," said Kirezci, as The New York Times reported. "Those are important to consider."</p>
<p>The study seems to add to the mounting evidence that the world's nations can greatly reduce future flooding risks by cutting emissions rapidly, especially since that could lower the odds of rapid ice-sheet collapse in Antarctica that would push up ocean levels even higher than forecast later in the century, as The New York Times reported.</p><p>However, Michael Oppenheimer, a climate scientist at Princeton University who was not involved in the study, told The New York Times that the world has now warmed so much that significant sea-level rise by 2050 is assured no matter what happens with emissions. "That means we also need to start preparing to adapt now," he said.</p>
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An example of a dry field in San Joachin Valley, California, during the California drought that lasted from 2012 to 2016. Citizens of the Planet / Education Images / Universal Images Group / Getty Images
By Jose Pablo Ortiz Partida
The immediate emergency of COVID-19 has been a powerful reminder that the most valuable things in our lives are our families, friends, and the welfare of our communities.
<p>The current pandemic is a threat to those closest to us today in a way that presages what we will experience on an accelerating basis due to the climate emergency. In a place like California's San Joaquin Valley (SJV), Latinos account for <a href="https://www.latimes.com/california/story/2020-07-25/coronavirus-covid-19-farm-workers-san-joaquin-valley" target="_blank">70 percent</a> of COVID-19 cases, even though they represent 42 percent of the population. Improving access to clean and affordable water even as the pandemic grows more urgent, is critical to reducing the types of burdens worsened by the COVID-19 crisis. Continuing the hard work on groundwater sustainability required by the Sustainable Groundwater Management Act (SGMA) could lessen the impact of future crises in the valley. The low level of preparation communities have experienced around the pandemic, echos what these same communities face for water management on a daily basis and will face with future climate change threats unless fundamental changes are made locally.</p>
Thousands of People in the SJV Live Without Reliable Access to Water.
<p>California is the wealthiest state in the most prosperous country in the world, and yet, there are close to one million people living without reliable access to safe, clean, and affordable drinking water. Most of these people are <a href="https://www.nytimes.com/2019/05/21/us/california-central-valley-tainted-water.html" target="_blank">concentrated in disadvantaged communities</a> in the SJV. California identifies <a href="https://oehha.ca.gov/calenviroscreen/sb535" target="_blank">disadvantaged communities</a> as areas that experience disproportionate levels of a combination of poverty, air and water pollution, high unemployment, and high rates of cardiovascular diseases and asthma. According to a report from the UC Davis Center for Regional Change, residents in these communities are <a href="https://regionalchange.ucdavis.edu/publication/water-justice" target="_blank">over 60% Hispanic</a>.</p><p><span></span>The SJV is one of the most productive agricultural regions in the world, <a href="https://www.ppic.org/wp-content/uploads/water-and-the-future-of-the-san-joaquin-valley-overview.pdf" target="_blank">producing more than half of California's agricultural output</a> with over 200 different crops and annual revenue of about 20 billion US dollars. The astonishing volume of water that agriculture requires has led to over-exploitation of groundwater and the continuous lowering of groundwater levels that has impacted water quality and quantity.</p><p>Groundwater is the primary source for household water needs and agricultural water supply. Yet, thousands of people are unable to drink and use the water in the SJV, because there are multiple contaminants in it. Some of the water pollution comes from natural sources and includes substances like arsenic, but most of it has emerged due to agricultural practices. These contaminants include pesticides and nitrates, which are linked to cancer, birth defects, and blue baby syndrome.</p><p>In years with average precipitation, water flowing in California's rivers from rain and melted snowpack meets about 60 percent of the state's water demand and groundwater meets the remainder. However, during dry years water supply sources shift and put severe stress on groundwater levels. During the California drought from 2012 to 2016, groundwater use, mostly from agricultural water pumping, <a href="https://www.sciencemag.org/news/2020/04/droughts-exposed-california-s-thirst-groundwater-now-state-hopes-refill-its-aquifers" target="_blank">grew to 80 percent</a> in some regions of the SJV increasing overdraft. Groundwater overdraft occurs when water extractions exceed recharge into an aquifer. An analogy is your bank account; extract more money than is put in, and your account will go dry. Aquifers are like a shared account, with some people taking out more than others. Consequently, thousands of domestic wells ran dry, unable to reach water due to lowered groundwater levels, in large part due to increased agricultural water pumping, and affecting thousands of people across the valley.</p><p>We think about drought as standalone events, but in reality, human actions triggered by droughts can have effects that continue long after the drought has ended, like permanently lowering the water table. In the SJV, the last drought has permanently reduced the capacity of some aquifers because overdraft left air in between soil particles instead of water, and the soils subsided eliminating the space for water storage. Overdraft also leads to infrastructure damage from land subsidence, that is when the ground levels drop, plus reduction of surface water, and an increase in water quality problems. That range of concerns brought by overdraft formed the basis of SGMA.</p>Groundwater Sustainability Plans Could Fix Part of the Problem but Are Currently Inadequate.
<p>SGMA passed in 2014 and is the first legislation in California to mandate sustainable management of groundwater resources. SGMA is intended to bring about groundwater sustainability by the year 2040. Local water agencies describe the means to achieve this goal in their Groundwater Sustainability Plans (GSPs). For those interested in the details of SGMA, <a href="https://water.ca.gov/Programs/Groundwater-Management/SGMA-Groundwater-Management" target="_blank">here is a thorough description of it</a>. The focus of this post is on the latest developments.</p><p>The 21 most critically over-drafted groundwater basins submitted their GSPs at the beginning of the year and are now under review by the California Department of Water Resources (DWR). External reviews of these plans argue that some of them do not sufficiently address current and future impacts on disadvantaged communities. For example, the Groundwater Leadership Forum (a group of organizations funded by the <a href="https://waterfdn.org/" target="_blank">Water Foundation</a> focused on ensuring the success of SGMA and of which UCS is part) also reviewed several GPSs and found gaps in how drinking water, climate change, stakeholder involvement, managed wetlands, and groundwater-dependent ecosystems were addressed in the plans. The Public Policy Institute of California (PPIC) reviewed 36 plans submitted for basins overlapping the SJV. They found Kings Basin (surrounding Fresno) stands out for having the highest number of domestic wells that may go dry, about 600 of them, under the proposed water level sustainable thresholds and yet the local groundwater plan considers that an <a href="https://www.ppic.org/blog/will-groundwater-sustainability-plans-end-the-problem-of-dry-drinking-water-wells/" target="_blank">insignificant impact from continued overdraft</a>. This is concerning and unacceptable. Public comments can be consulted in the <a href="https://sgma.water.ca.gov/portal/gsp/all" target="_blank">SGMA portal from DWR</a>.</p><p>I, and many others are concerned that multiple GSPs have questionable integrations of climate change projections. GSPs are considering numerous projects to tackle their local overdraft, yet they are not planning for the uncertain future that climate change is bringing. To reduce some of the vulnerabilities that we see now, GSPs need to integrate climate change and show benefits on the range of future scenarios.</p><p>Another concern is that on May 14, the <a href="http://www.ebudget.ca.gov/FullBudgetSummary.pdf" target="_blank">Governor announced</a> a $40 million cut on funding for SGMA. Part of the money was expected to support 37 new staff positions at DWR to uphold its statutory obligation on reviewing GSPs. While the budget still allocated $26 million of existing Proposition 68 bond funds to help with implementation projects in critically overdraft basin, it is unlikely that DWR will have the capacity to review the GSPs thoroughly. However, the governor's budget did prioritize safe and affordable drinking water and the State Water Board approved <a href="http://californiawaternewsdaily.com/infrastructure/state-water-board-approves-2020-21-funds-to-improve-access-to-healthy-drinking-water/" target="_blank">$130 million for 2020-2021</a> to projects that support such objective on vulnerable communities.</p>Without Bold Action and Preparation, Climate Change Threats May Bring Similar Impacts to Those of COVID-19.
<p>The lack of drinking water causes many residents in the valley to rely on bottled water as their primary source for drinking and cooking. Panic buying at the beginning of the pandemic left stores across the valley without bottled water. In the case of COVID-19, unsafe and unreliable access to water has endangered a multitude of low-income communities by preventing them from performing protective, hygienic acts, handwashing, in particular, and forcing them to go to public water supply kiosks. As we've all learned, hand washing is one of the most necessary measures needed to slow and stop the spread of a virus. Without a correct implementation of groundwater sustainability plans under SGMA, many of these risks will continue.</p><p>Shelter in place orders resulted in people losing their jobs and hence, their source of income and being unable to pay utility services. Small utility services were also impacted because of low economic margins of operations in which small drops in income translate to being unable to provide service. Fortunately, many organizations and individuals wrote a letter to Governor Newsom that prompted him to issue an <a href="https://www.gov.ca.gov/2020/04/02/governor-newsom-issues-executive-order-protecting-homes-small-businesses-from-water-shutoffs/" target="_blank">executive order</a> protecting homes and small businesses from water shutoffs.</p><p>We now have the opportunity to give meaning to these current hardships by learning from them to prevent hardships from climate change. Climate change is a threat intensifier. In this case, the threat is a virus, and historical inequities and water vulnerabilities increased its impact on the most vulnerable among us. An example of the unpreparedness of the system to support our vulnerabilities during times of crisis is seen in the case of school children who rely on school lunches as their main meal of the day but are now unable to access this resource due to school closures. Some farmworkers, <a href="https://www.nytimes.com/2020/04/02/us/coronavirus-undocumented-immigrant-farmworkers-agriculture.html" target="_blank">while cataloged as 'essential' by the federal government</a> during this crisis, are undocumented and were not part of the stimulus package. The height of irony is <a href="https://www.kvpr.org/post/covid-19-deepens-food-insecurity-san-joaquin-valley" target="_blank">farmworkers struggled with access to food distribution</a> when they needed it.</p>There Is No Scenario Where Water Is Not Absolutely Necessary to Lessen the Impacts During a Crisis.
<p>One of my <a href="https://blog.ucsusa.org/cecilia-moura/covid-19-air-pollution-and-health-impacts-an-interview-with-pediatric-pulmonologist-dr-denise-serebrisky" target="_blank">colleagues wrote</a> that moments of crisis often expose the weak points of a system. In the SJV, the weak points of the water system have been exposed for years and won't be strengthened without managing water resources sustainably. This is evidenced by the number of people in the SJV without access to safe, clean, and affordable drinking water. Considering that about <a href="https://www.theguardian.com/environment/2020/feb/28/california-water-wells-dry-sgma" target="_blank">95% of valley residents</a> depend on groundwater for at least part of their water, it is critical that GSPs explicitly include strategies for addressing some of the current and future water issues in the SJV.</p><p>Numerous, various kinds of climate threats will come, whether they develop as <a href="https://www.nature.com/articles/s41558-020-0804-2" target="_blank">floods, heatwaves, wildfires, droughts, or other climate hazards</a>, we need to be prepared and do everything possible to improve sustainable water management for all. While future climate-change-derived crises most likely will be different than COVID-19, there is no scenario where water is not absolutely necessary to lessen the impacts.</p>
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Young Children May Have Higher Coronavirus Levels, Raising Concerns About Schools Reopening
31 July
Health + Wellness
A group of children eat ice cream in Washington Square Park during the coronavirus pandemic on May 25, 2020 in New York City. Gotham / Getty Images
As the debate about reopening schools continues in the U.S., a new study has found that children under five might have 10 to 100 times more coronavirus in their upper respiratory tracts than adults.
<p>The study, <a href="https://jamanetwork.com/journals/jamapediatrics/fullarticle/2768952" target="_blank">published in JAMA Pediatrics</a> Thursday, does not prove that children are passing on the virus, but does suggest that they could be "important drivers" of community spread. And this raises concerns about what will happen when and if children return to school, the researchers said.</p><p>"The school situation is so complicated — there are many nuances beyond just the scientific one," study leader and Ann and Robert H. Lurie Children's Hospital of Chicago pediatric infectious diseases expert Dr. Taylor Heald-Sargent told <a href="https://www.nytimes.com/2020/07/30/health/coronavirus-children.html" target="_blank">The New York Times</a>. "But one takeaway from this is that we can't assume that just because kids aren't getting sick, or very sick, that they don't have the virus."</p>
<p>The assumption that young children are not a driving force behind disease outbreaks is one of the arguments for reopening schools in the fall. </p><p>In recommending in-person schooling, the Centers for Disease Control and Prevention (CDC) <a href="https://www.cdc.gov/coronavirus/2019-ncov/community/schools-childcare/reopening-schools.html" target="_blank">said</a> that current data suggests low rates of transmission between school age children or from students to teachers. The study authors acknowledged this, but also said the evidence was limited.</p><p>"Early reports did not find strong evidence of children as major contributors to SARS-CoV-2 spread, but school closures early in pandemic responses thwarted larger-scale investigations of schools as a source of community transmission," they wrote. "As <a href="https://www.ecowatch.com/tag/public-health" target="_self">public health</a> systems look to reopen schools and day cares, understanding transmission potential in children will be important to guide public health measures."</p>
<p>The research was inspired when Dr. Heald-Sargent noticed that children's coronavirus tests were showing up positive after fewer cycles, The New York Times explained. Each cycle picks up more virus, so a low "cycle threshold," or C.T., means more virus in the sample.</p><p>"It wasn't even something we had set out to look for," she told The New York Times.</p><p>So the researchers looked at 145 nasal tests from patients in the Chicago area with mild to moderate symptoms who were tested within one week of falling ill, <a href="https://www.france24.com/en/20200730-young-children-carry-higher-levels-of-coronavirus-study" target="_blank">AFP explained</a>. The tests, conducted between March 23 and April 27, came from three different age brackets. Forty-six were from children under 5, 51 from children aged five to 17 and 48 from adults aged 18 to 65.</p>
<p>Older children and adults had similar median C.T.s, but the median C.T. for younger children was significantly lower, the study found.</p><p>"The observed differences in median CT values between young children and adults approximate a 10-fold to 100-fold greater amount of SARS-CoV-2 in the upper respiratory tract of young children," the <a href="https://www.ecowatch.com/tag/scientists" target="_self">scientists</a> concluded.</p><p>One limitation of the study is that the tests pick up the virus's RNA, not live virus itself. The study authors said that higher levels of virus nucleic acid in children have been shown to correlate with the ability to grow live virus from samples in the lab. However, other scientists said that the study would be more conclusive if the researchers had tested for live virus.</p><p>"I suspect that it probably will translate into meaning that there is more actual virus there as well, but we can't say that without seeing the data," Juliet Morrison, a virologist at the University of California, Riverside who was not involved with the study, told The New York Times.</p>
<p>The study's results are backed up by other research. German scientists found that asymptomatic children still had viral loads as high or higher than adults, and a French study found children without symptoms had similar C.T. values to children who were visibly sick.</p><p>However, it is possible that young children's higher viral load does not translate to higher transmission. A South Korean study found that children aged 10 to 19 spread coronavirus in the home at levels equal to adults, but children under nine did not, according to AFP.</p><p>Still, some external public health experts think the results of the JAMA Pediatrics study should be included in the discussion of reopening schools.</p><p>"Now that we're rolling into the end of July and looking at trying to open up schools the next month, this really needs to be considered," University of Manitoba virologist Jason Kindrachuk,, who was not involved with the research, told The New York times.</p>
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