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Antarctica Was a Rainforest During the Times of Dinosaurs, New Study Finds
A team of scientists drilled into the ground near the South Pole to discover forest and fossils from the Cretaceous nearly 90 million years ago, which is the time when dinosaurs roamed the Earth, as the BBC reported.
The frozen continent was once home to a swampy rainforest and had average temperatures around 53 degrees Fahrenheit, according to the new study published in the journal Nature. The world than was much warmer and sea levels were 550 feet higher than they are now, according to Newsweek.
The discovery of preserved roots, pollen and spores in west Antarctica shows that the world at that time was a lot warmer than previously thought. For vegetation to grow in Antarctica during that period, the Earth needed a greenhouse climate and carbon dioxide levels much higher than scientists had estimated they were. It also means, the continent did not have glaciers then, as The Guardian reported.
In fact, the vegetation was probably similar to what is found New Zealand's South Island today, according to the BBC.
"We didn't know that this Cretaceous greenhouse climate was that extreme," Dr. Johann Klages of the Alfred Wegener Institute in Germany and a co-author of the research said to The Guardian. "It shows us what carbon dioxide is able to do."
Speaking to Newsweek, he said, "We didn't expect anything like this. An entirely terrestrial record of Antarctic forest soil at 82 degrees south!"
The research took place about 550 miles away from the South Pole. The discovery and analysis were conducted out by an international team of researchers led by geoscientists from the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research in Germany and included Imperial College London scientists.
They scientists found traces of the preserved forest in a sediment core drilled from the seabed in West Antarctica, near the Pine Island and Thwaites glaciers. They noticed an odd color in one section that would have once been on land. color. "We just saw that we probably found something very special and it turned out to be true during our analyses of the following two-and-a-half years," Klages told Newsweek.
According to a statement from Imperial College London, the team used a CT-scan to analyze the section of the core and discovered a dense network of fossil roots, which was so well preserved that they could make out individual cell structures. The sample also contained many traces of pollen and spores from plants, including from flowering plants — the first ever found at these high Antarctic latitudes.
"The preservation of this 90-million-year-old forest is exceptional, but even more surprising is the world it reveals," Professor Tina van de Flierdt, from the Department of Earth Science & Engineering at Imperial College London and a co-author on the paper, said in the statement. "Even during months of darkness, swampy temperate rainforests were able to grow close to the South Pole, revealing an even warmer climate than we expected."
The researcher reconstructed the environment of this preserved forest, by analyzing descendant plants, as well as temperature and precipitation indicators within the sample. They created an animated movie of their discovery.
"We have a really nice X-ray movie through the sediment core," Karsten Gohl, who spearheaded the expedition on Germany's Research Vessel Polarstern, said to the BBC. "It's like we've drilled into a modern swamp environment and you're seeing the living root system, small plant particles and pollen - but this is all preserved from 90 million years ago. It's amazing."
One remarkable aspect of the plant fossils is that the plants had to adapt to three to four months of darkness.
"Probably these plants, they had a much more effective way of shutting down for a much longer amount of time and then come back successfully," Klages said to the BBC. "That was quite an interesting adaptation, which is not present right now on the planet, but which can evolve."
The discovery of plant fossils has lessons for today as the climate crisis bears down on us. Dr. James Bendle, an expert in organic geochemistry from the University of Birmingham in the UK, told The Guardian that the Antarctic ecosystem holds clues for our future since the unabated use of fossil fuels use could push concentrations of carbon dioxide to levels similar to those from 90 million years ago by the start of the next century.
"Ultimately, if we have an atmosphere of more than 1,000 parts per million of carbon dioxide, we are committing ourselves to a future planet that has little to no ice, and ultimately an Antarctic continent that would be vegetated and wouldn't have an ice cover," he said.
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At least 14 people were killed when Tropical Storm Amanda walloped El Salvador Sunday, Interior Minister Mario Duran said.
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By Mark Kaufman
Some fires won't die.
They survive underground during the winter and then reemerge the following spring, as documented in places like Alaska. They're called "overwintering," "holdover," or "zombie" fires, and they may have now awoken in the Arctic Circle — a fast-warming region that experienced unprecedented fires in 2019. The European Union's Copernicus Atmosphere Monitoring Service is now watching these fires, via satellite.
<img lazy-loadable="true" src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.pjiv81dzvE2uWSwZVXH_hhoYKLl6go7m4QXYRodC8aQ/img.jpg" id="d48aa" class="rm-shortcode" data-rm-shortcode-id="79880bae7db4253c569739c541d26709" />Zombie fires could be awakening in the Arctic
<iframe width="100%" height="150" scrolling="no" class="rm-shortcode twitter-embed-1258045476731002882" id="twitter-embed-1258045476731002882" lazy-loadable="true" src="/res/community/twitter_embed/?iframe_id=twitter-embed-1258045476731002882&created_ts=1588776389.0&screen_name=DrTELS&text=Are+these+%27zombie%27+fires%3F+As+the+snow+melted+in+Arctic+Siberia+last+week%2C+a+number+of+fires+have+been+detected+by+s%E2%80%A6+https%3A%2F%2Ft.co%2FMBZbBYqA2o&id=1258045476731002882&name=Dr+Thomas+Smith+%F0%9F%94%A5%F0%9F%8C%8F" frameborder="0" data-rm-shortcode-id="4e094a6eb3039925709e345158051f4b"></iframe>
So What Happens Now?<p>In the future, fire researchers expect an uptick in zombie fires. That's because the <a is="" href="https://mashable.com/article/climate-change-business-as-usual-catastrophic/" target="_blank">planet is relentlessly warming</a>, particularly in the Arctic, which means more ready-to-burn vegetation. It's already happening. "Arctic fires<strong> </strong>are becoming more common overall," explained Miami University's McCarty.</p><p is="">And some of these fires will inevitably smolder all winter, under the snow. "With a warmer Arctic, we're more likely to see overwintering fires," noted Smith.</p><p is="">It's challenging to stop zombie fires. They can happen in extremely remote places, without any roads or means of dousing them before they erupt. "We have no way of fighting them," said McCarty. "They're often fairly far-removed. How are we going to put them out?"</p><p is="">It's a question of profound importance in the decades ahead. Preventing human-caused Arctic wildfires will be critical, emphasized McCarty. That's because Arctic fires aren't just burning trees, they're often burning through <a is="" href="https://blogs.agu.org/geospace/2019/12/06/peatlands-release-more-methane-when-disturbed-by-roads/" target="_blank">peatlands</a>, which release bounties of the heat-trapping greenhouse gas methane into the air. When it comes to trapping heat, methane is <a href="https://www.epa.gov/ghgemissions/overview-greenhouse-gases" target="_blank">25 times more potent</a> than carbon dioxide over the course of a century.</p><p is="">It's a vicious cycle. The warming Arctic produces more fires. More fires burn more forests and peatlands. This releases more methane and carbon dioxide into the air. This contributes to ever more planetary heating.</p><p is="">"Not stopping these zombie fires means further degrading these Arctic ecosystems," said McCarty. "Further warming leads to more zombie fires. It's not great."</p><a target="_blank"></a><blockquote><a href="https://mashable.com/article/zombie-fires-arctic/#" target="_blank"></a></blockquote>
The total number of confirmed coronavirus cases passed six million Sunday, even as many countries begin to emerge from strict lockdowns.
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By Daniel Yetman
Bleach and vinegar are common household cleaners used to disinfect surfaces, cut through grime, and get rid of stains. Even though many people have both these cleaners in their homes, mixing them together is potentially dangerous and should be avoided.
Can You Mix Bleach and Vinegar?<p>Bleach can refer to any chemical that's used to get rid of stains or disinfect surfaces. The most typical form used as a cleaner is sodium hypochlorite. By itself, bleach can damage your skin but is <a href="https://www.ncbi.nlm.nih.gov/books/NBK441921/" target="_blank">non-toxic</a> when inhaled. However, it can become potentially lethal to inhale when mixed with other household cleaners.</p><p>Sodium hypochlorite is made up of a sodium, oxygen, and chlorine atoms. When this molecule is mixed with the acetic acid in vinegar or other types of acid, it releases chlorine gas. <a href="https://emergency.cdc.gov/agent/chlorine/basics/facts.asp" target="_blank">Chlorine gas</a> is extremely dangerous to human health. It's so powerful that Germany used it during World War I as a chemical weapon.</p><p>Vinegar isn't the only cleaner you need to be careful mixing with bleach. Bleach also reacts with <a href="https://www.doh.wa.gov/YouandYourFamily/HealthyHome/Contaminants/BleachMixingDangers" target="_blank">ammonia</a> to create chlorine gas. Bleach can also react to some oven cleaners, insecticides, and hydrogen peroxide.</p><p>Many household cleaners contain a chemical called <a href="https://www.acs.org/content/acs/en/pressroom/presspacs/2019/acs-presspac-october-2-2019/cleaning-with-bleach-could-create-indoor-air-pollutants.html" target="_blank">limonene</a> that gives them a citrus smell. When bleach fumes mix with limonene, they create small particles that may be damaging to both people's and animals' health. However, more research is needed to examine these particles' potential health risks.</p>
Is it Safe to Mix Them in Small Amounts?<p>According to the <a href="https://www.doh.wa.gov/YouandYourFamily/HealthyHome/Contaminants/BleachMixingDangers" target="_blank">Washington State Department of Health</a>, even low levels of chlorine gas, less than 5 parts per million (ppm), is likely to irritate your eyes, throat, and nose. It's never a good idea to mix these two cleaners together.</p><p>Unlike some other dangerous chemicals like carbon monoxide, chlorine gives off a distinctly <a href="https://www.ncbi.nlm.nih.gov/books/NBK537213/" target="_blank">pungent and irritating odor</a>. If you notice a strong smell after mixing cleaners, it's a good idea to immediately leave the area.</p><p>The <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3136961/" target="_blank">severity of symptoms</a> you develop after breathing in chlorine gas depends on how concentrated it is, measured in parts per million (ppm), and how long you inhale it.</p><ul><li><strong>0.1 to 0.3 ppm.</strong> At this level, humans can smell the pungent odor of chlorine gas in the air.</li><li><strong>5 to 15 ppm. </strong>A concentration over 5 ppm causes irritation to the mucus membranes in your mouth and nose.</li><li><strong>Over 30 ppm.</strong> At a concentration higher than 30 ppm, chlorine gas can cause chest pain, shortness of breath, and coughing.</li><li><strong>Above 40 ppm.</strong> Concentrations higher than 40 ppm can cause potentially dangerous fluid build-up in your lungs.</li><li><strong>Above 430 ppm</strong>. Breathing in more than <a href="https://www.ncbi.nlm.nih.gov/books/NBK537213/" target="_blank">430 ppm</a> of chlorine gas can be lethal within 30 minutes.</li><li><strong>Above 1,000 ppm</strong>. Inhaling chlorine gas above this level can be deadly immediately.</li></ul>
Can You Combine Bleach and Vinegar in a Washing Machine?<p>Mixing bleach and vinegar in your washing machine is also a bad idea. Chlorine gas may be released from your washing machine when you take your clothes out. It may also leave traces of chlorine gas on your clothes.</p><p>If you use bleach in your laundry, it's a good idea to wait several loads before using vinegar.</p>
Symptoms of Exposure to a Bleach and Vinegar Reaction<p>The severity of the symptoms you'll develop after chlorine exposure depends on the amount of chlorine gas you inhale. Symptoms usually start fairly quickly. <a href="https://www.ncbi.nlm.nih.gov/books/NBK537213/" target="_blank">Most people</a> exposed to low amounts of chlorine gas recover without complications.</p><p>If your exposure to chlorine gas is relatively brief, you may notice irritation of your nose, mouth, and throat. Lung irritation may develop if you breathe in chlorine deeply.</p><p>According to the <a href="https://emergency.cdc.gov/agent/chlorine/basics/facts.asp" target="_blank">Centers for Disease Control and Prevention</a>, if you accidentally breathe in chlorine, you can experience the following:</p><ul><li><a href="https://www.healthline.com/health/eye-health/sudden-blurred-vision" target="_blank">blurry vision</a></li><li>a burning sensation in your nose, throat, or eyes</li><li><a href="https://www.healthline.com/health/cough" target="_blank">coughing</a></li><li><a href="https://www.healthline.com/health/chest-pain" target="_blank">tightness in your chest</a></li><li><a href="https://www.healthline.com/health/breathing-difficulties" target="_blank">trouble breathing</a></li><li><a href="https://www.healthline.com/health/pulmonary-edema" target="_blank">fluid in your lungs</a></li><li><a href="https://www.healthline.com/health/nausea" target="_blank">nausea</a></li><li><a href="https://www.healthline.com/health/vomiting" target="_blank">vomiting</a></li><li><a href="https://www.healthline.com/health/epiphora" target="_blank">watery eyes</a></li><li><a href="https://www.healthline.com/health/wheezing" target="_blank">wheezing</a></li></ul>
What to Do if You Get Bleach and Vinegar on Your Skin or Inhaled Chlorine Gas Vapors<p>There's <a href="https://emergency.cdc.gov/agent/chlorine/basics/facts.asp" target="_blank">no cure</a> for breathing in chlorine gas. The only treatment option is removing the chlorine from your body as quickly as possible and seeking immediate medical attention to treat your symptoms.</p><p>If you breathe in chlorine gas, you can follow these steps to help get the chlorine out of your system:</p><ul><li>Immediately go somewhere where you can breathe in fresh air.</li><li>Change and wash any clothes that may have been contaminated.</li></ul><blockquote><strong>MEDICAL EMERGENCY<br><br></strong>If your symptoms are severe, call 911 or the National Capital Poison Center (NCPC) at 800-222-1222 and follow their instructions.<br></blockquote><p>Spilling <a href="https://www.healthline.com/health/bleach-on-skin#first-aid" target="_blank">bleach</a> can cause irritation to your skin. You can take the following steps to reduce your chances of developing complications:</p><ul><li>Remove jewelry or clothes that came in contact with bleach and clean them after you wash your skin.</li><li>Rinse your skin with a sponge or an absorbent cloth over a sink.</li><li>Avoid touching other parts of your body such as your face while cleaning.</li><li>Seek immediate medical attention if you spill bleach in your eyes or if you burn your skin.</li></ul><p>Vinegar may also irritate your skin. Even though it's unlikely to cause any serious health complications, it's a good idea to wash vinegar off your skin to avoid any redness or soreness.</p>
Takeaway<p>Mixing bleach and vinegar creates potentially lethal chlorine gas. If you notice a pungent smell after mixing household cleaners, you should immediately leave the area and try to breathe in fresh air.</p><p>If you or somebody you know notice any symptoms of chlorine gas poisoning, it's a good idea to immediately call 911 or the NCPC at 800-222-1222<em>.</em></p>
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Around 500 climate activists on Saturday gathered outside the new Datteln 4 coal power plant in Germany's Ruhr region, to protest against its opening.
Climate Activists Speak Out<p>Speaking at the protest, German Fridays for Futures climate activist Luisa Neubauer said: "It's a post-factual power plant. The facts speak for themselves." She said it was a "provocation," to mark the planned coal phaseout with a new coal power plant.</p><p>"We're going to stop this power plant, we're going to bring it to a standstill, we will win this conflict," Neubauer added.</p><p>Former miners also attended the protest. "We condemn the fact that coal mining in Germany was halted and jobs were lost, only for coal now to be imported from other countries to power Datteln 4," said Sebastian Suszka, a former workers' council member.</p><p>Greta Thunberg, founder of climate activist movement Fridays for Futures tweeted that Saturday was "a shameful day for Europe.</p>
Germany's Coal Phaseout<p>Earlier this year, Germany announced a roadmap to see coal phased out, at the latest by 2038. It laid out plans for eight coal-fired power plants to be taken off the grid in 2020.</p><p>It was an important step for the largest contributor of carbon emissions in the EU — accounting for more than 22 percent of the bloc's CO2 emissions. Over a third of the electricity generated in Germany comes from burning coal.</p><p>Germany's coal commission has recommended that solutions be found for coal plants that are already built but not-yet-in-use to keep them from operating.<br></p><p>The state of North-Rhine Westphalia insisted that the additional carbon dioxide emissions from the new plant would be compensated by the closure of four other power plants.</p>
By Julia Ries
Around the world, there have been several cases of people recovering from COVID-19 only to later test positive again and appear to have another infection.
The Viral Material in Re-Positive Cases Isn’t Infectious<p>The Korean study examined 285 patients who tested positive again for the new coronavirus after they recovered from COVID-19, which had been confirmed via a negative test result.</p><p>The researchers swabbed the patients and examined the viral material to determine whether it was still actively infectious.</p><p>The team was unable to isolate live viral material, indicating that the positive diagnostic tests were picking up dead virus particles.</p><p>"[This] may speak for the fact that the virus may be dead or not be fit enough to grow — therefore the virus may not be fit enough to infect a new host," said <a href="http://www.providence.org/doctors/profile/1099717-andres-romero" target="_blank">Dr. Andres Romero</a>, an infectious disease specialist at Providence Saint John's Health Center in Santa Monica, California.</p><p>The researchers also tested 790 people who'd been in close contact with the "re-positive" patients. Of the 27 who tested positive, no cases appeared to be caused from exposure to someone who appeared to have a reinfection.</p><p>The report also found that the vast majority of recovered patients (96 percent) had neutralizing antibodies, indicating that they conferred immunity.</p><p>"Whether this is indicative of a completely protective response remains to be proven. If this study holds true, then people who have recovered can get back to work," Zapata said.</p><p>In response to the new findings, South Korea eliminated a policy requiring discharged patients to isolate for 2 weeks.</p>
Conducting and Interpreting PCR Tests<p>The tests widely used to diagnose COVID-19 are called polymerase chain reaction (PCR) tests.</p><p>The tests swab a person's nose or throat and try to pick up the virus's genetic material, or RNA.</p><p>According to <a href="https://www.cdc.gov/coronavirus/2019-ncov/hcp/faq.html" target="_blank">guidance</a> from the U.S. Centers for Disease Control and Prevention (CDC), a positive result on a PCR test doesn't "necessarily mean infectious virus is present or that the patient is contagious."</p><p>Infectious disease experts have suspected that the test kits aren't picking up actively infectious viral material in recovered patients who test positive again, but rather dead remnants of the virus.</p><p>We see this occur with other viruses, too.</p><p>"We know other viruses like parainfluenza, human metapneumovirus, or RSV [respiratory syncytial virus] may linger for months in certain patients, and that does not represent infectious state," Romero said. "Coronavirus may be the same."</p>
We Still Need to Practice Caution<p>While the findings are promising, infectious disease experts say we still need to practice caution.</p><p>More research is needed to validate these findings and determine whether they apply to distinct parts of the population, such as those who are immunocompromised.</p><p>It's common for immunocompromised patients — such as those with cancer — to continue testing positive for a virus for longer, since it takes their immune system more time to clear the virus out of their body.</p><p>"I don't think we can be 100 percent certain of whether each recovered person is no longer contagious. Again, this may differ with distinct population groups," Zapata said.</p><p>Physicians are seeing some hospitalized patients testing positive for a month after they were first swabbed for COVID-19. It's unclear whether these patients still shed infectious virus, according to Zapata.</p><p>Everyone's body mounts a distinct immune response based on their age and overall health. Different individuals will clear the virus out at different speeds, according to Zapata.</p><p>Until we have more data and a preventive vaccine, it's crucial to continue adhering to the <a href="https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html" target="_blank">safety precautions</a> laid out by the CDC.</p><p>"The reality is that moving forward, the best approach will be keeping social/physical distancing, wearing a mask, and frequent hand hygiene in order to control the spread of the virus," Romero said.</p>
The Bottom Line<p>Doctors and researchers have been unsure whether people who recover from COVID-19 who test positive again continue to be contagious, or if they could get a second infection.</p><p>New <a href="https://www.cdc.go.kr/board/board.es?mid=a30402000000&bid=0030" target="_blank">research</a> published by the Korea Centers for Disease Control and Prevention has found that recovered COVID-19 patients who test positive again aren't infectious.</p><p>The study also found that most patients who recover have neutralizing antibodies that protect them from getting sick again.</p><p>Though the study is promising, health experts say we need more data to validate the findings and determine whether they apply to all patient populations.</p>
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By Samantha Hepburn
In the expansion of its iron ore mine in Western Pilbara, Rio Tinto blasted the Juukan Gorge 1 and 2 — Aboriginal rock shelters dating back 46,000 years. These sites had deep historical and cultural significance.
The destruction of a significant Aboriginal site is not an isolated incident. Puutu Kunti Kurrama And Pinikura Aboriginal Corporation