A mostly empty 110 freeway toward downtown Los Angeles, California on April 28, 2020. Robert Gauthier / Los Angeles Times via Getty Images
The shelter in place orders that brought clean skies to some of the world's most polluted cities and saw greenhouse gas emissions plummet were just a temporary relief that provided an illusory benefit to the long-term consequences of the climate crisis. According to new research, the COVID-19 lockdowns will have a "neglible" impact on global warming, as Newshub in New Zealand reported.
<p>The severe measures that were taken on a global scale to stem the tide of the novel coronavirus pandemic did curb pollution in the atmosphere, but the researchers found the impact will cut global heating by just 0.01 degrees Celsius by 2030, as <a href="https://www.theguardian.com/environment/2020/aug/07/covid-19-lockdown-will-have-negligible-impact-on-climate-crisis-study" target="_blank">The Guardian</a> reported.</p><p>"The direct effect of the pandemic-driven [lockdown] will be negligible," said the researchers, whose analysis was led by Piers Forster at the University of Leeds in the UK, as The Guardian reported. "In contrast, with an economic recovery tilted towards green stimulus and reductions in fossil fuel investments, it is possible to avoid future warming of 0.3C by 2050."</p>
<p>The study was published in <em><a href="https://www.nature.com/articles/s41558-020-0883-0" target="_blank">Nature Climate Change</a></em>. To figure out the impact of the lockdowns, the researchers looked at mobility data from Google and Apple in 123 countries that covers 99 percent of <a href="https://www.ecowatch.com/tag/fossil-fuels">fossil fuel</a> emissions. The information gives real-time information on travel and work patterns, which allows researchers to use advanced computations to estimate emissions levels, according to The Guardian.</p><p>Professor Keith Shine, at the University of Reading and not part of the study team, told The Guardian: "It is deeply impressive to get such a near-real-time analysis of the climate impact [of the lockdowns]."</p><p>What they found was that emissions from people using transportation was at its lowest in April, with nitrogen oxide levels falling by 30 percent and carbon dioxide levels dropping by 25 percent, according to Newshub.</p>
<p>Professor Dave Reay, chair of carbon management at the University of Edinburgh who was not involved in the study, told Newshub that the results are not surprising "given the long lifetime of carbon dioxide and the massive pool of fossil carbon already swilling around in our atmosphere."</p><p>The declines show that swift and decisive changes in how people behave have the potential to dramatically impact the environment in the short term. That was evident in the cleaner skies and the suddenly visible animals in Venice's canals and the streets of various cities. In Wuhan, China, the epicenter of the outbreak, air quality improved so much that NASA satellite imagery showed the average density of tropospheric nitrogen dioxide – a toxic chemical that reduces immunity – dropped significantly below normal levels, as Newshub reported.</p>
<p>Of course, those lockdowns came with a steep economic price as people were put out of work and supply chains and distribution were severely disrupted. In other words, lockdowns of that scale are so damaging that they are impossible to maintain. Furthermore, once the lockdowns lifted, emissions levels started to rise again. That phenomenon means the world needs to transition to a zero-emissions economy by investing in <a href="http://www.ecowatch.com/renewable-energy/">renewable energy</a> and burying CO2, according to the researchers, as The Guardian reported.</p><p>"It is now make or break for the 1.5 Celsius target," said Forster, as The Guardian reported. "This is a once-in-a-generation opportunity to really change the direction of society. We do not have to go back to where we were, because times of crisis are also the time to change."</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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EcoWatch Daily Newsletter
Hurricane Florence on Sept. 12, 2018. ESA / A.Gerst / CC BY-SA 2.0
Hurricane forecasters predict the 2020 hurricane season will be the second-most active in nearly four decades.
<p>Meteorologists at Colorado State University, a standard bearer for seasonal hurricane predictions, <a href="https://tropical.colostate.edu/Forecast/2020-08.pdf?utm_campaign=Hot%20News&utm_source=hs_email&utm_medium=email&utm_content=2&_hsenc=p2ANqtz-8zppZX1aY8kszJMl4pymaG2IVnBoxg_RsagLPapjJ8aGo2XQ968cLrBctxgq9xd2xxXARykY6pJeW2jeyJQXvoYQceuKtwcrqZPG5zx_5RuqYi30k" target="_blank">estimate</a> the 2020 season will see 24 named storms, including 12 total hurricanes and 5 major hurricanes. Each of those predictions are about double that for a normal season, and include storms that have already occurred. The 2020 season has already set numerous records for its early activity, with about 90% of the official season ahead. </p>
<p>Even if 2020 sees fewer storms than the new prediction — which is the most dire in CSU's 37-year history — officials may still run out of letters with which to name storms and be forced to use the Greek alphabet for overflow since the letters Q, U, X, Y and Z are not used. The only other time officials were forced to use the Greek alphabet was 2005 which included five hurricanes (Dennis, Katrina, Rita, Stan and Wilma) so destructive their names have been <a href="https://web.archive.org/web/20200206163321/https://www.wmo.int/pages/prog/www/tcp/documents/FINAL-REPORT-HC-28.pdf?utm_campaign=Hot%20News&utm_source=hs_email&utm_medium=email&utm_content=2&_hsenc=p2ANqtz-8zppZX1aY8kszJMl4pymaG2IVnBoxg_RsagLPapjJ8aGo2XQ968cLrBctxgq9xd2xxXARykY6pJeW2jeyJQXvoYQceuKtwcrqZPG5zx_5RuqYi30k" target="_blank">retired</a> from future use.</p>
<p><strong>For a deeper dive:</strong> <a href="https://weather.com/storms/hurricane/news/2020-08-05-2020-atlantic-hurricane-season-august-forecast?utm_campaign=Hot%20News&utm_medium=email&_hsmi=92748923&_hsenc=p2ANqtz-9IeFic75USwIHEONdWfCYXQ8_7OUfGg935e2ZWAJ19r-S7PFFYnkEShxJuDADx--LfAWh9Re8qZUABmO28GxjuO6LAZQ&utm_content=92748923&utm_source=hs_email" target="_blank">Weather Channel</a>, <a href="https://thehill.com/homenews/news/510743-forecasters-predicting-extremely-active-hurricane-season?utm_campaign=Hot%20News&utm_medium=email&_hsmi=92748923&_hsenc=p2ANqtz--hsOZRdAx5CW0_AthIxD9BdjfNezoxng3dWCeggOgY1yRG8bNuG8vVBKT6Nj7gRdMdKIlp64NhEWe7lEG5AhMtAWbt0Q&utm_content=92748923&utm_source=hs_email" target="_blank">The Hill</a>, <a href="https://www.cbsnews.com/news/hurricane-season-2020-forecast-extremely-active-24-named-storms/" target="_blank">CBS</a>, <a href="https://www.usatoday.com/story/news/nation/2020/08/05/hurricane-season-2020-forecasters-new-prediction-storms/3300043001/?utm_campaign=Hot%20News&utm_medium=email&_hsmi=92748923&_hsenc=p2ANqtz-_Gv965dHJB2Gw4UflskHjum7HNV0oIQNQsmt6xf8c7UhOJWdzBmJg6KQG2Y2IUfwcf0SC_5breM_diZwqBsLGlIOCQ1Q&utm_content=92748923&utm_source=hs_email" target="_blank">USA Today</a>, <a href="https://www.news4jax.com/weather/2020/08/05/csu-now-predicts-24-named-storms-this-hurricane-season/?utm_campaign=Hot%20News&utm_medium=email&_hsmi=92748923&_hsenc=p2ANqtz-98p9Sx1J9aCYELsYqAxq_NvnUKiuPGenlr8RhjE5Vl0BXqwwrTb3-rNVWnqlQ1p_S822-x3M1kH4bO6BQX77k6fXOBQQ&utm_content=92748923&utm_source=hs_email" target="_blank">News4JAX</a>, <a href="https://www.wyff4.com/article/new-hurricane-season-outlooks-issued-by-csu-following-record-start/33526545?utm_campaign=Hot%20News&utm_medium=email&_hsmi=92748923&_hsenc=p2ANqtz-_Es88-ppyd952aYUVMbtPBKFjm-SCwIgxKgtJa7ARuuYvj0KrpWAJu9weBR8Yj1UNjbNavxkpfTUEgYhXTJXRgWhcpvQ&utm_content=92748923&utm_source=hs_email" target="_blank">WYFF4</a>, <a href="https://www.wfla.com/weather/tracking-the-tropics/tracking-the-tropics-experts-update-hurricane-season-forecast-to-extremely-active-with-24-named-storms/?utm_campaign=Hot%20News&utm_medium=email&_hsmi=92748923&_hsenc=p2ANqtz-8gI_x82R_Ym-JpgNAe36TIeCmpYq_tL0h3E4Po56Is0VXZV7SER6dHcOd5VKF6toR3zyS6NNJt0-HVF9CGsg6Qo3m93A&utm_content=92748923&utm_source=hs_email" target="_blank">WFLA</a>, <a href="https://www.wmbfnews.com/2020/08/05/first-alert-colorado-state-researchers-now-forecasting-one-most-active-hurricane-seasons-ever/?utm_campaign=Hot%20News&utm_medium=email&_hsmi=92748923&_hsenc=p2ANqtz-8LSCUABuP8V2moEiiA_iXxA_lWNdOdQI-Va28nwthmTdB4jA580tIZqCSvXRZ0oxjkjn6TK5jKuXAXmTS8eRePWvdbhw&utm_content=92748923&utm_source=hs_email" target="_blank">WMBF</a>; Climate Signals background: <a href="https://newsletter.climatenexus.org/e2t/tc/VWK7-l2CwspQW29Q6_46m2pk6W805GfB4dqjyxN8Qx57B3p_9rV1-WJV7CgGrpW7Gz0R23XF3ZhVh2zck28rYDSW7P0DJ56yhFp5W6kXZM-2D0FtpW611m4m2B03y1W4Zr1DR3bx5ypW7Bq_zT3SJD_sW30xvBb6-p0wmV9XJxQ90-YR5N7dQDz7chFMZW1lNKnQ4lfvs6VC1DRX1CmQQ2W3_G0_V67fz6dN3Yts2wmJTDBN7fJpJb9NfShW4HfVvQ5bWCw_W5J8BKs5Fp9NPW1VfTt35YDYcvW5jPjbQ2hRlfxW5HFfBx4MSlm0W16YyZy4fBq5KW6qGJcf4FPc-wN1gdKHLpgq9FW5nsZgC70ZgGyW3S9Z7q1V2NGsW31pbsQ1130MN3mPW1" target="_blank">2020 Atlantic hurricane season</a><br/></p><p><em>Reposted with permission from <a href="https://climatenexus.org/" target="_blank">Climate Nexus</a>.</em></p><p><em><em>For more </em><a href="http://ecowatch.com/climate-change-news/" target="_blank"><em>climate change</em></a><em> and </em><a href="http://ecowatch.com/business/renewables/" target="_blank"><em>clean energy</em></a><em> news, you can follow Climate Nexus on </em><a href="https://twitter.com/ClimateNexus" target="_blank"><em>Twitter</em></a><em> and </em><a href="https://www.facebook.com/ClimateNexus/" target="_blank"><em>Facebook</em></a><em>, and sign up for daily </em><a href="http://climatenexus.us4.list-manage1.com/subscribe?u=d1f5797e59060083034310930&id=7c84c08aaa" target="_blank"><em>Hot News</em></a><em>.</em></em></p><p><em><em><em>Correction: An earlier version of this story incorrectly described the Colorado State University's updated hurricane forecast. The forecast predicts the highest number of named storms of any forecast CSU has published, but would result in fewer storms than the 2005 hurricane season. Additionally, the reference to the amount of the hurricane season still to come should have referenced the Accumulated Cyclone Energy index, not the official hurricane season. This story has been updated.</em></em></em></p>
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Smoke rises above wrecked buildings following a deadly explosion on Aug. 4, 2020 in Beirut, Lebanon. Marwan Tahtah / Getty Images
By Alexander Freund
Lebanese Prime Minister Hassan Diab says he believes Tuesday's explosion in Beirut could have been caused by large quantities of ammonium nitrate stored in the port.
<p>The ammonium nitrate in question was said to have been brought to the Lebanese capital on a freight ship that was impounded for safety reasons in 2013. It had been en route from Georgia to Mozambique.</p><p>Diab said about 2,750 metric tons (3,025 short tons) of the highly explosive chemical had been stored at the port since then without the necessary safety precautions in place.</p><p>The blast was so powerful that it could be heard in Cyprus, about 200 kilometers (120 miles) to the west, media reported.</p>
What Is Ammonium Nitrate?
<p>Ammonium nitrate is a white crystalline salt that can be fairly cheaply produced from ammonia and nitric acid. It is soluble and often used as fertilizer, as nitrogen is needed for healthy plant development.</p><p>Ammonium nitrate in its pure form is not dangerous. It is, however, heat sensitive. At 32.2 degrees Celsius (89.96 degrees Fahrenheit), ammonium nitrate changes its atomic structure, which in turn changes its chemical properties.</p><p>When large quantities of ammonium nitrate are stored in one place, heat is generated. If the amount is sufficiently vast, it can cause the chemical to ignite. Once a temperature of 170 C is reached, ammonium nitrate starts breaking down, emitting nitrous oxide, better known as laughing gas. Any sudden ignition causes ammonium nitrate to decompose directly into water, nitrogen and oxygen, which explains the enormous explosive power of the salt.</p>Deadly Disasters
<p>As ammonium nitrate is a highly explosive chemical, many countries strictly regulate its use. Over the past 100 years, there have been several disasters involving the chemical.</p><p>In 1921, for example, a massive blast occurred at a BASF chemical plant in Ludwigshafen in the German state of Rhineland-Palatinate. About 400 metric tons of a mixture of ammonium sulfate and ammonium nitrate exploded, killing 559 people and injuring 1,977. The plant was largely destroyed in the blast, which could be heard as far away as Munich, some 300 kilometers (186 miles) distant.</p><p>In 2015, explosions caused by ammonium nitrate ripped through the <a href="https://www.dw.com/en/china-convicts-dozens-for-last-years-giant-explosions-in-tianjin/a-36324321" target="_blank">Chinese port city of Tianjin</a>. Eight hundred metric tons of the chemical were said to have been stored along with other substances in a warehouse for hazardous materials. The blasts killed 173 people and destroyed an entire city district.</p><p>Two years earlier, in 2013, an ammonium nitrate explosion occurred at the West Fertilizer Company site in Texas, killing 14 people. And in 2001, 31 people died in Toulouse, France, in an explosion caused by the chemical.</p>Terrorist Favorite
<p>In Germany, the purchase and use of ammonium nitrate is regulated by the explosives act. This is because the cheap, highly explosive and relatively easily obtainable material has in the past been used by terrorists to carry out attacks.</p><p>For example, in 1995, U.S. conspiracy theorist and gun enthusiast Timothy McVeigh used a mixture of ammonium nitrate and other substances to bomb the Alfred P. Murrah Federal Building in Oklahoma City. Norwegian far-right extremist Anders Behring Breivik also used ammonium nitrate in a car bomb attack in Oslo in 2011.</p>From Your Site Articles
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The Wildlife from Space project uses satellite technology to identify, count and monitor species such as emperor penguins in Antarctica. British Antarctic Survey / YouTube
New satellite images have revealed 11 new throngs of emperor penguin colonies, lifting the number of known emperor penguin colonies by 20 percent and their total population by 5 to 10 percent, according to The Guardian.
<p>"The [new colonies] are an exciting discovery," said Peter Fretwell, at the British Antarctic Survey (BAS), who led the research, according to The Guardian. "Whilst this is good news, the colonies are small and so only take the overall population count up to just over half a million penguins."</p><p>While that may sound like great news for penguins, the truth is these penguins are just as threatened as the rest of their flightless feathered friends, according to <a href="https://earther.gizmodo.com/satellite-images-reveal-new-penguin-colonies-in-melting-1844609508" target="_blank">Gizmodo</a>.</p><p>The 11 new colonies bring the total number up to 61 colonies spread across the continent. Now, the newly discovered birds will act as "canaries in the coalmine" when it comes to studying the impact of global warming, experts have said, as <a href="https://www.cnn.com/2020/08/05/world/penguins-antarctica-satellite-scn-scli-intl/index.html" target="_blank">CNN</a> reported.</p>
<p>The study, which used satellite mapping technology, will "provide an important benchmark for monitoring the impact of environmental change on the population of this iconic bird," researchers said, according to CNN.</p><p>The study was published in <em><a href="https://zslpublications.onlinelibrary.wiley.com/toc/20563485/0/0" target="_blank">Remote Sensing in Ecology and Conservation</a></em> on Wednesday. The findings help shed light on just how threatened the emperor penguins really are. While the <a href="https://www.ecowatch.com/tag/climate-crisis">climate crisis</a> is rapidly altering the surface of Earth, <a href="http://www.ecowatch.com/tag/antarctica">Antarctica</a> is running ahead of most of the world. It is warming three times faster than the most of the planet. With all that warmth comes the loss of <a href="http://www.ecowatch.com/tag/sea-ice">sea ice</a>, which is devastating to emperor penguins since they breed on the ice and need it to be stable, as Gizmodo reported.</p><p>"Emperor penguins are vulnerable to climate change, particularly the breakup of the sea ice on which they breed," said study author Peter Fretwell, a researcher with the British Antarctic Survey, in an email to Gizmodo. "Finding more penguins and studying their movements and distribution will be important if we are to understand their struggle to survive in the warming Antarctic environment."</p>
<p>As the <a href="https://www.bbc.com/news/science-environment-53549299" target="_blank">BBC</a> noted, the emperors' whole life cycle is centered on the availability of sea ice, and if this is diminished in the decades ahead, as climate models project, then the animals' numbers will suffer. Some models predict that penguin colonies will drop by 90 percent, according to The Guardian.</p><p>The discoveries were made by spotting the distinctive red-brown guano patches the birds leave on the ice, according to The Guardian. The findings were made possible by higher-resolution images from a new satellite, as previous scans were unable to pick up smaller colonies.</p><p>The European Space Agency's Sentinel-2 satellite was launched in June 2015 and has a resolution of 10 meters. This enabled a search for the smaller penguin colonies. Emperor penguins were expected to be present at fairly regular intervals around the coast of Antarctica, so the search was targeted in areas where none were known. "In every gap where we thought there might be a colony, we found one," said Fretwell, as The Guardian reported.</p>
<p>The European Space Agency makes these images available online, so the team was able to analyze images from 2016, 2018 and 2019. By searching the images for "small areas of brown pixels," or clumps of penguin guano, and targeting their searches by looking at areas near known colonies and breeding habitat, the researchers were able to find these new communities, according to Gizmodo.</p><p>The next step is to direct satellites with very high, 30cm-resolution cameras over the colonies to enable the penguins to be counted. "It is dark at the moment in Antarctica, so we can't count them yet," said Fretwell, as The Guardian reported. "The sun will come up either later this month or next month in most of these locations, and then we will start."</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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Rising Temperatures to Be More Deadly Than Infectious Diseases, New Study Says
04 August
Health + Wellness
A girl sits under a temporary shade made by joining two bed in Churu, Rajasthan on June 4, 2019. Temperatures in the Indian desert city hit 50 degrees C (122 F) for the second time in three days, sending residents scrambling for shade. MONEY SHARMA / AFP via Getty Images
Current efforts to curb an infectious disease show the potential we have for collective action. That action and more will be needed if we want to stem the coming wave of heat-related deaths that will surpass the number of people who die from all infectious diseases, according to a new study, as The Guardian reported.
<p>By the end of this century, extreme heat spells could kill roughly as many people as all infectious diseases combined, including HIV, malaria and yellow fever, according to <a href="http://impactlab.org/wp-content/uploads/2020/08/CIL_NBER_MortalityPaper_3Aug2020.pdf" target="_blank">a new study</a> from the Climate Impact Lab, a group of <a href="https://www.ecowatch.com/tag/climate-crisis" target="_self">climate</a> economists and researchers at several U.S. universities. Specifically, the study projects that climate change's effect on temperatures could raise global mortality rates by 73 deaths per 100,000 people in 2100 if greenhouse gas emissions stay where they are, according to <a href="https://www.technologyreview.com/2020/08/03/1005965/climate-change-fueled-heatwaves-could-kill-millions/" target="_blank">MIT Technology Review</a>. Under a scenario of continued high emissions, the researchers estimate that climate change's impact on mortality will cost the world roughly 3.2 percent of global economic output in 2100, according to the <a href="http://www.impactlab.org/news-insights/global-death-rate-from-rising-temperatures/" target="_blank">Climate Impact Lab</a>.</p><p>"The global cost to human health from warming is likely to be profound," said Solomon Hsiang, a climate policy researcher at UC Berkeley and an author of the study, in a UC Berkeley <a href="https://news.berkeley.edu/story_jump/without-action-climate-deaths-could-soar-by-centurys-end-says-new-study/" target="_blank">press release</a>. "We are studying the risk of death faced by our own children. Today's 10-year-old fifth-grader will turn 65 in 2075, facing mortality risks from climate change every year of their retirement. Failing to address climate change is not that different from driving your kids around without a seat belt: you are putting their lives at risk."</p>
<p>To conduct the study, the authors analyzed the historic links between temperature records and mortality data in dozens of nations, and projecting future deaths using highly regional climate projections. They sifted through the information in an enormous global dataset of 399 million death records across 41 countries, accounting for 55 percent of the global population. They also looked at temperature records to see how the two are related. That methodology allowed them to pinpoint both direct causes such as heat stroke and less obvious links such as a spike heart attacks during a heat wave, as The Guardian reported.</p><p>The researchers accounted for the mitigations that wealthy countries make, like air conditioning and cooling centers, leading them to the conclusion that poorer countries will bear the brunt of the suffering from extreme heat.</p>
<p>"A lot of older people die due to indirect heat [effects]," said Amir Jina, an environmental economist at the University of Chicago and a co-author of the study, published by the National Bureau of Economic Research, as The Guardian reported. "It's eerily similar to Covid – vulnerable people are those who have pre-existing or underlying conditions. If you have a heart problem and are hammered for days by the heat, you are going to be pushed towards collapse."</p><p>In the worst-hit countries, including Ghana, Bangladesh, Pakistan and Sudan, climate change could be responsible for an additional 200 or more deaths per 100,000 by the end of the century, the research shows, according to the Climate Impact Lab. By contrast, places like Canada and Norway will see fewer weather-related deaths and fewer people will die from freezing temperatures as they become less frequent.</p><p>"You see the really bad impacts at the tropics," added Jina. "There's not one single worldwide condition, there's a lot of different changes with poorer people much more affected with limited ability to adapt. The richer countries, even if they have increases in mortality, can pay more to adapt to it. It's really the people who have done the least to cause climate change who are suffering from it."</p>
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Should Plants and Animals That Relocate Because of Climate Change Be Considered Invasive?
04 August
Animals
America Pikas are found from the Sierra Nevada to the Rocky Mountains, and have been migrating to higher elevations. Jon LeVasseur / Flickr / Public Domain
By Jenny Morber
Caribbean corals sprout off Texas. Pacific salmon tour the Canadian Arctic. Peruvian lowland birds nest at higher elevations.
<p>In the past 100 years, the planet has warmed in the range of <a title="" href="https://earthobservatory.nasa.gov/features/GlobalWarming/page3.php" target="_blank">10 times faster</a> than it did on average over the past 5,000. In response, thousands of species are traveling poleward, climbing to higher elevations, and diving deeper into the seas, seeking their preferred environmental conditions. This great migration is challenging traditional ideas about native species, the role of conservation biology and what kind of environment is desirable for the future.</p><p>In a <a title="" href="https://science.sciencemag.org/content/355/6332/eaai9214?rss=1" target="_blank">2017 review for <em>Science</em></a>, University of Tasmania marine ecology professor Gretta Pecl and colleagues wrote, "[C]limate change is impelling a universal redistribution of life on Earth. For marine, freshwater, and terrestrial species alike, the first response to changing climate is often a shift in location." In fact, Pecl says, data suggest that at least 25% and perhaps as much as 85% of Earth's estimated 8.7 million species are already shifting ranges in response to climate change.</p><p>But when they arrive, will they be welcome? Traditional definitions classify species according to place. "Native" species arrived without human help and usually before widespread human colonization, so are likely to have natural predators and are unlikely to go rogue. Non-natives are newcomers and suspect. Though 90% cause no lasting damage, 10% become invasive — meaning that they harm the environment, the economy or human health. Last year <a title="" href="https://www.un.org/sustainabledevelopment/blog/2019/05/nature-decline-unprecedented-report/" target="_blank">a multinational report</a> flagged invasive species as a key driver of Earth's biodiversity crisis.</p>
<img lazy-loadable="true" src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzUzMzA5My9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYyMzM0MTI3NH0.oMhAPPXcPHecfraPvGcNqifWPj2zCRImoy-dGHjAIwA/img.jpg?width=980" id="89fd0" class="rm-shortcode" data-rm-shortcode-id="5acc10628b03ca297c3b53aefdcaacb2" data-rm-shortcode-name="rebelmouse-image" />
Known and anticipated changes in species distribution due to climate change around the world have implications for culture, society ecosystems, governance and climate change. Figure used with permission from Gretta T. Pecl, originally published on 31 Mar 2017 in Science 355(6332).
<p>How we define species is critical, because these definitions influence perceptions, policy and management. The U.S. National Invasive Species Council (NISC) defines a biological invasion as "the process by which non-native species breach biogeographical barriers and extend their range" and states that "preventing the introduction of potentially harmful organisms is … the first line of defense." But some say excluding newcomers is myopic.</p><p>"If you were trying to maintain the status quo, so every time a new species comes in, you chuck it out," says Camille Parmesan, director of the French National Centre for Scientific Research, you could gradually "lose so many that that ecosystem will lose its coherence." If climate change is driving native species extinct, she says, "you need to allow new ones coming in to take over those same functions."</p><p>As University of Florida conservation ecologist Brett Scheffers and Pecl warned in a <a href="https://www.nature.com/articles/s41558-019-0526-5" target="_blank">2019 paper in <em>Nature Climate Change</em></a>, "past management of redistributed species … has yielded mixed actions and results." They concluded that "we cannot leave the fate of biodiversity critical to human survival to be randomly persecuted, protected or ignored."</p>Existing Tools
<p>One approach to managing these climate-driven habitat shifts, suggested by University of California, Irvine marine ecologist Piper Wallingford and colleagues in <a href="https://www.nature.com/articles/s41558-020-0768-2" target="_blank">a recent issue of Nature Climate Change</a>, is for scientists to adapt existing tools like the <a href="https://www.iucn.org/theme/species/our-work/invasive-species/eicat" target="_blank">Environmental Impact Classification of Alien Taxa (EICAT)</a> to assess potential risks associated with moving species. Because range-shifting species pose impacts to communities similar to those of species introduced by humans, the authors argue, new management strategies are unnecessary, and each new arrival can be evaluated on a case-by-case basis.</p><p>Karen Lips, a professor of biology at University of Maryland who was not associated with the study, echoes the idea that each case is so varied and nuanced that trying to fit climate shifting species into a single category with broad management goals may be impractical. "Things may be fine today, but add a new mosquito vector or add a new tick or a new disease, and all of a sudden things spiral out of control," she says. "The nuance means that the answer to any particular problem might be pretty different."</p><img lazy-loadable="true" src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzUzMzEwOC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTU5Nzc3Mzg5OH0.mfmERsqdqXWZxoqSAKjoS_djEwYmc5sqJGvc3vaxQhM/img.jpg?width=980" id="5d0ac" class="rm-shortcode" data-rm-shortcode-id="0b6c13afe6f55afc739919773358c08f" data-rm-shortcode-name="rebelmouse-image" />
In recent years, northern flying squirrels in Canada have found themselves in the company of new neighbors — southern flying squirrels expanding their range as the climate warms. Public Domain / USFW
<p>Laura Meyerson, a professor in the Department of Natural Resources Science at the University of Rhode Island says scientists should use existing tools to identify and address invasive species to deal with climate-shifting species. "I would like to operate under the precautionary principle and then reevaluate as things shift. You're sort of shifting one piece in this machinery; as you insert a new species into a system, everything is going to respond," she says. "Will some of the species that are expanding their ranges because of climate change become problematic? Perhaps they might."</p><p>The reality is that some climate-shifting species may be harmful to some conservation or economic goals while being helpful to others. While sport fisherman are excited about red snapper moving down the East Coast of Australia, for example, if they eat juvenile lobsters in Tasmania they could harm this environmentally and economically important crustacean. "At the end of the day … you're going to have to look at whether that range expansion has some sort of impact and presumably be more concerned about the negative impacts," says NISC executive director Stas Burgiel. "Many of the [risk assessment] tools we have are set up to look at negative impact." As a result, positive effects may be deemphasized or overlooked. "So that notion of cost versus benefit … I don't think it has played out in this particular context."</p>Location, Location, Location
<p>In a <a href="https://www-nature-com.ezp3.lib.umn.edu/articles/s41558-020-0770-8" target="_blank">companion paper</a> to Wallingford's, University of Connecticut ecology and evolutionary biology associate professor Mark Urban stressed key differences between invasive species, which are both non-native and harmful, and what he calls "climate tracking species." Whereas invasive species originate from places very unlike the communities they overtake, he says, climate tracking species expand from largely similar environments, seeking to follow preferred conditions as these environments move. For example, an American pika may relocate to a higher mountain elevation, or a marbled salamander might expand its New England range northward to seek cooler temperatures, but these new locations are not drastically different than the places they had called home before.</p><p>Climate tracking species may move faster than their competitors at first, Urban says, but competing species will likely catch up. "Applying perspectives from invasion biology to climate-tracking species … arbitrarily chooses local winners over colonizing losers," he writes.</p><img lazy-loadable="true" src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMzUzMzExOS9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYzNDcyNzA3Mn0.n_ebiiONrITEyBQmEWJFAbXDUd4ZWzPOBE8CKnyHm1Q/img.jpg?width=980" id="ec01c" class="rm-shortcode" data-rm-shortcode-id="84cbbac4ee5597e41544f6cedfcce139" data-rm-shortcode-name="rebelmouse-image" />
The marbled salamander, a native of the eastern U.S., is among species whose range could expand northward to accommodate rising temperatures. Seánín Óg / Flickr / CC BY-NC-ND 2.0
<p>Urban stresses that if people prevent range shifts, some climate-tracking species may have nowhere to go. He suggests that humans should even <a href="https://ensia.com/features/time-for-trees-to-pack-their-trunks/" target="_blank">facilitate movement</a> as the planet warms. "The goal in this crazy warming world is to keep everything alive. But it may not be in the same place," Urban says.</p><p>Parmesan echoes Urban, emphasizing it's the distance that makes the difference. "[Invasives] come from a different continent or a different ocean. You're having these enormous trans-global movements and that's what ends up causing the species that's exotic to be invasive," she says. "Things moving around with climate change is a few hundred miles. Invasive species are moving a few thousand miles."</p><p>In 2019 University of Vienna conservation biology associate professor Franz Essl published a similar argument for species classification beyond the native/non-native dichotomy. Essl uses "neonatives" to refer to species that have expanded outside their native areas and established populations because of climate change but not direct human agency. He argues that these species should be considered as native in their new range.</p>They Never Come Alone
<p>Meyerson calls for caution. "I don't think we should be introducing species" into ecosystems, she says. "I mean, they never come alone. They bring all their friends, their microflora, and maybe parasites and things clinging to their roots or their leaves. … It's like bringing some mattress off the street into your house."</p><p>Burgiel warns that labeling can have unintended consequences. We in the invasive species field … focus on non-native species that cause harm," he says. "Some people think that anything that's not native is invasive, which isn't necessarily the case." Because resources are limited and land management and conservation are publicly funded, Burgiel says, it is critical that the public understands how the decisions are being made.</p><p>Piero Genovesi, chair of the International Union for the Conservation of Nature's Invasive Species Specialist Group, sees the debate about classification — and therefore about management — as a potential distraction from more pressing conservation issues.</p><p>"The real bulk of conservation is that we want to focus on the narrow proportion of alien species that are really harmful," he says. In Hawaii "we don't discuss species that are there [but aren't] causing any problem because we don't even have the energy for dealing with them all. And I can tell you, no one wants to remove [non-native] cypresses from Tuscany. So, I think that some of the discussions are probably not so real in the work that we do in conservation."</p><p>Indigenous frameworks offer another way to look at species searching for a new home in the face of climate change. According to <a href="https://link.springer.com/article/10.1007%2Fs11625-018-0571-4" target="_blank">a study</a> published in Sustainability Science in 2018 by Dartmouth Native American studies and environmental studies associate professor Nicholas Reo, a citizen of the Sault Ste. Marie Tribe of Chippewa Indians, and Dartmouth anthropology associate professor Laura Ogden, some Anishnaabe people view plants as persons and the arrival of new plants as a natural form of migration, which is not inherently good or bad. They may seek to discover the purpose of new species, at times with animals as their teachers. In their paper Reo and Ogden quote Anishnaabe tribal chairman Aaron Payment as saying, "We are an extension of our natural environment; we're not separate from it."</p>The Need for Collaboration
<p>The successful conservation of Earth's species in a way that keeps biodiversity functional and healthy will likely depend on collaboration. Without global agreements, one can envision scenarios in which countries try to impede high-value species from moving beyond their borders, or newly arriving species are quickly overharvested.</p><p>In Nature Climate Change, Sheffers and Pecl call for a Climate Change Redistribution Treaty that would recognize species redistribution beyond political boundaries and establish governance to deal with it. Treaties already in place, such as the Convention on International Trade in Endangered Species of Wild Fauna and Flora, which regulates trade in wild plants and animals; the Migratory Bird Treaty Act; and the Agreed Measures for the Conservation of Antarctic Fauna and Flora, can help guide these new agreements.</p><p>"We are living through the greatest redistribution of life on Earth for … potentially hundreds of thousands of years, so we definitely need to think about how we want to manage that," Pecl says.</p><p>Genovesi agrees that conservationists need a vision for the future. "What we do is more to be reactive [to known threats]. … It's so simple to say that destroying the Amazon is probably not a good idea that you don't need to think of a step ahead of that." But, he adds, "I don't think we have a real answer in terms of okay, this is a threshold of species, or this is the temporal line where we should aim to." Defining a vision for what success would look like, Genovesi says, "is a question that hasn't been addressed enough by science and by decision makers."</p><p>At the heart of these questions are values. "All of these perceptions around what's good and what's bad, all [are based on] some kind of value system," Pecl says. "As a whole society, we haven't talked about what we value and who gets to say what's of value and what isn't."</p><p>This is especially important when it comes to marginalized voices, and Pecl says she is concerned because she doesn't "think we have enough consideration or representation of Indigenous worldviews." Reo and colleagues <a href="https://cpb-us-e1.wpmucdn.com/sites.dartmouth.edu/dist/9/52/files/2012/10/Reo_etal_AIQ_invasive_species_2017.pdf" target="_blank">wrote in American Indian Quarterly in 2017</a> that climate change literature and media coverage tend to portray native people as vulnerable and without agency. Yet, says Pecl, "The regions of the world where [biodiversity and ecosystems] are either not declining or are declining at a much slower rate are Indigenous controlled" — suggesting that Indigenous people have potentially managed species more effectively in the past, and may be able to manage changing species distributions in a way that could be informative to others working on these issues.</p><p>Meanwhile, researchers such as Lips see species classification as native or other as stemming from a perspective that there is a better environmental time and place to return to. "There is no pristine, there's no way to go back," says Lips. "The entire world is always very dynamic and changing. And I think it's a better idea to consider just simply what is it that we do want, and let's work on that."</p>
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Biologists are studying the impact of climate change on the Nenets and their reindeer herds. Deutsche Welle
Biologist Egor Kirillin is on a special mission. Deep in the Siberian wilderness in the Russian Republic of Sakha, he waits on the Olenjok river until reindeer come thundering into the water.
<p>The river crosses the huge herd's migration route south, and provides Kirillin's one chance to tag them with radio transmitters. It's not a job for the faint of heart, but it is the only way to gather vital data on these animals' migration patterns — and try to uncover why their numbers are falling.</p><p>Meanwhile, Kirillin's colleague at the Siberian Branch of the Russian Academy of Sciences, ethnologist Alexander Volkovitsky is researching the life and customs of the Nenets. </p><p>Nomadic reindeer herders who move with their domesticated herds animals by season, the Nenets cover exhausting distances across the Russian Arctic. Even small climatic changes can have a dramatic effect on their environment, and Volkovitsky wants to understand what global warming will mean for the Nenets' traditional way of life.</p><p><em>A film by Boas Schwarz</em></p>
<iframe scrolling="no" width="640" height="477" frameborder="0" align="middle" name="Russia: Climate change and Arctic reindeer | DW.COM" marginwidth="0" marginheight="0" src="https://www.dw.com/embed/640/av-54398592"></iframe>
<p><em>Reposted with permission from <a href="https://www.dw.com/en/reindeer-and-their-nomadic-herders-face-climate-change/a-54432629?maca=en-VAM_volltext_ecowatch-28485-html-copypaste" target="_blank">Deutsche Welle.</a></em></p>From Your Site Articles
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More Than Half of COVID-19 Survivors in Study Reported Psychiatric Disorders
04 August
Health + Wellness
Healthcare workers admit a coronavirus patient to a special intensive care unit set up outside Milan's San Raffaele hospital, where 55 percent of patients surveyed developed mental health symptoms after recovering from the new coronavirus. MIGUEL MEDINA / AFP via Getty Images
A study from a hospital in Milan, Italy has uncovered another complication to the process of recovering from the new coronavirus. More than half of patients surveyed one month after their treatment had developed a psychiatric disorder.
<p>The study, published in <a href="https://www.sciencedirect.com/science/article/pii/S0889159120316068" target="_blank">Brain, Behavior, and Immunity</a> on Thursday, found that 55 percent of former patients surveyed experienced either post-traumatic stress disorder (PTSD), anxiety, depression, insomnia or obsessive compulsive (OC) symptoms.</p><p>"After three weeks of treatments, I was healing from COVID, at home, had no fever, and just a little cough," one of the patients surveyed for the study said. "But sometimes at night, my breath could go away all of a sudden, making me feel as if I was to die. I knew what it was because I had suffered from panic attacks in the past. I stayed there out on the balcony, for hours, trying to put fresh air into my lungs. It was terrible. Panic made me suffer more than COVID."</p>
<p>To obtain their results, researchers surveyed 402 patients who were treated at Milan's San Raffaele Hospital between April 6 and June 9: 265 men and 137 women. The patients were all initially assessed at the emergency room and then either admitted to the hospital or treated at home.</p><p>A month after treatment, the patients were interviewed and given questionnaires to assess their <a href="https://www.ecowatch.com/tag/mental-health" target="_self">mental health</a>. They reported psychiatric symptoms at the following rates:</p><ul><li>Anxiety: 42 percent</li><li>Depression, 31 percent</li><li>Insomnia: 40 percent</li><li>PTSD: 28 percent</li><li>OC Symptoms: 20 percent</li></ul>
<p>Women fared worse psychologically than men, <a href="https://www.theguardian.com/world/2020/aug/03/survivors-of-covid-19-show-increased-rate-of-psychiatric-disorders-study-finds" target="_blank">The Guardian reported</a>. People who had previously been diagnosed with a psychiatric disorder also were more likely to develop mental health symptoms after recovering from COVID-19.</p><p>The researchers were not surprised by their results, because previous studies of other coronaviruses had turned up increased mental health problems in survivors. For example, 10 to 35 percent of those who recovered from SARS have experienced psychiatric symptoms.</p><p>The reason COVID-19 survivors develop these symptoms could be down to two main reasons, the researchers think: the immune system's response to the disease and the stress of illness, such as fear, stigma and social isolation.</p>
<p>Research suggests a link between immune-triggered inflammation and mental illness. In addition, the study found that outpatients had worse mental health outcomes than people treated in the hospital, suggesting isolation played a role.</p><p>"Also considering the worse severity of COVID-19 in hospitalized patients, this observation suggests that less healthcare support could have increased the social isolation and loneliness typical of COVID-19 pandemics, thus inducing more psychopathology after remission," the researchers wrote.</p><p>They said their findings warranted more investigation into the link between the pandemic and mental health issues.</p><p>"PTSD, major depression, and anxiety, are all high-burden non-communicable conditions associated with years of life lived with disability," they wrote. "Considering the alarming impact of COVID-19 infection on mental health, the current insights on inflammation in psychiatry, and the present observation of worse inflammation leading to worse depression, we recommend to assess psychopathology of COVID-19 survivors and to deepen research on inflammatory biomarkers, in order to diagnose and treat emergent psychiatric conditions."</p><p>The impact of the pandemic on mental health isn't limited to disease survivors, however, as <a href="https://www.techtimes.com/articles/251558/20200804/covid-19-psychiatric-disorders-like-ptsd-and-depression-prevalent-in-survivors.htm" target="_blank">Tech Times pointed out</a>.</p><p><a href="https://www.ecowatch.com/tag/public-health" target="_self">Public health</a> experts have already warned about a second pandemic of psychological disorders even among those who do not contract the disease. The fear of illness and the stress of losing employment or simply following current events could all take a toll.</p>
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