African Wetlands a Major Source of Methane Emissions, Study Finds
Methane emissions are a far more powerful greenhouse gas than carbon dioxide – about 28 times more powerful. And they have been rising steadily since 2007. Now, a new study has pinpointed the African tropics as a hot spot responsible for one-third of the global methane surge, as Newsweek reported.
Satellite data captured a large influx of water from East African lakes, including Lake Victoria, flowing into the wetlands of South Sudan. That water triggered plant growth and microbial activity that produced a massive amount methane, as the BBC reported.
"Methane is the second most important greenhouse gas, behind carbon dioxide," Mark Lunt, an atmospheric scientist at the University of Edinburgh in Scotland, told Newsweek. "We need to be able to understand how and why it is changing in our atmosphere to inform how we might mitigate future emissions."
Lunt is the lead author of the new study published in the journal Atmospheric Chemistry and Physics. Lunt and his team used six years of satellite imagery to figure out if there was methane coming from Africa, which had been largely overlooked because of a dearth of atmospheric data, according to Newsweek.
"There are very few studies that have focused in detail on Africa, primarily because there isn't much atmospheric methane data from there," said Lunt in a university press release. "Using satellite data gives a unique perspective on the continent that wouldn't otherwise be available."
The research team used data from GOSAT, the Japanese Greenhouse Gases Observing Satellite, to look at annual and seasonal methane emissions in sub-Saharan Africa.
The area identified in the study, the South Sudanese wetland, is recognized by UNESCO as one of the largest freshwater ecosystems in the world. It covers an estimated 22,000 square miles.
Satellite images "show the Sudd wetlands expanded in size, and you can even see it in aerial imagery – they became greener," said Paul Palmer, an atmospheric scientist at the University of Edinburgh who co-authored the research, to the BBC. "There's not much ground-monitoring in this region that can prove or disprove our results, but the data we have fits together beautifully."
The new research helps put together the pieces of a puzzle that has vexed scientists about the sources of methane emissions. While fossil fuels and agricultural practices have certainly made enormous contributions to the release of methane, there is undoubtedly a natural source as well, as the BBC reported.
Methane in the atmosphere had stabilized during the early 2000s, but atmospheric concentrations spiked in 2007 and then again in 2014.
"Global levels of methane in the atmosphere have been on the rise since the mid-2000s, after a period of relative stability," said Lunt, as Newsweek reported. "There are many different explanations for why this is the case but the primary suspects have been an increase in microbial sources such as wetlands and agriculture from the tropics, as well as increases in fossil fuel emissions from countries such as the U.S. and China. Alternatively the sink – the process of removal of methane in the atmosphere – could have decreased resulting in the resumption of growth we see."
The climate crisis will lead to an increase in methane emissions from natural sources, since warmer temperatures will cause wetland microbes to accelerate the rate they break down and to release more methane, according to a study published in the Proceedings of the National Academy of Sciences.
"Wetland methane is produced through a process known as methanogenesis. Essentially wetlands are anaerobic environments which are ideal for the production of methane," Lunt explained Newsweek. "Microorganisms break down organic matter in a process that results in the production of methane."
Lunt added that a study like this is important for identifying future interventions and improving predictions for Earth's climate.
"In order to understand how methane might change in the future, it is essential that we can adequately explain changes in the present and recent past," said Lunt in a University of Edinburgh statement. "Studies such as this can help narrow down the list of possible explanations, and hopefully improve our predictive capabilities for the future."
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By Julia Conley
A new campaign unveiled this weekend by the nonprofit organization Fossil Free Media aims to expand on the goals of the fossil fuel divestment movement, cutting into oil and gas companies' profit margins through their public relations and ad campaigns.
<div id="1dcf1" class="rm-shortcode" data-rm-shortcode-id="d5e39a5a3812bc2589ba8aa0563756e0"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1330177734799208465" data-partner="rebelmouse"><div style="margin:1em 0">PR and ad companies' work for the fossil fuel industry is pushing the planet past the breaking point.… https://t.co/wOuDBM26ne</div> — Clean Creatives (@Clean Creatives)<a href="https://twitter.com/cleancreatives/statuses/1330177734799208465">1605974060.0</a></blockquote></div>
<div id="21b90" class="rm-shortcode" data-rm-shortcode-id="bdc23e69ff18075b4fb5df6d4939b9f5"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1330205383848288257" data-partner="rebelmouse"><div style="margin:1em 0">Porter Novelli isn't some small shop: they've got offices and clients in 60 countries and are part of @Omnicom, the… https://t.co/iw0BCmrdzx</div> — Jamie Henn (@Jamie Henn)<a href="https://twitter.com/jamieclimate/statuses/1330205383848288257">1605980652.0</a></blockquote></div><p>"It's a BIG deal that they're dropping fossil fuel clients—let's make sure it's the drop that starts a flood," wrote Henn. </p>
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By Jason Farley
COVID-19 has disrupted our daily lives, and it is poised to completely disrupt the holiday season. As people make holiday plans and think about ways to reduce the risks to their loved ones, a strategy is essential.
Are masks really necessary at family gatherings?<p>If you're gathering with friends and family who don't live in your home, yes. Just because you're with people you know doesn't mean you're safe from the coronavirus. Infection rates are <a href="https://coronavirus.jhu.edu/data/new-cases-50-states" target="_blank" rel="noopener noreferrer">higher now than they have ever been</a> in the U.S., and <a href="https://youtu.be/ehdgceGzQxs" target="_blank" rel="noopener noreferrer">small gatherings have been a source</a> of viral spread. All it takes is one infected person who doesn't know they have the coronavirus to infect others.</p><p>Remember, people can be <a href="https://medical.mit.edu/covid-19-updates/2020/07/how-long-symptom-onset-person-contagious" target="_blank" rel="noopener noreferrer">contagious two to three days</a> before symptoms show – that's one thing that makes this virus so hard to stop. And it's why, even if you feel fine, you should wear a mask.</p><p>The Centers for Disease Control and Prevention now estimates that when both people are wearing masks, the <a href="https://www.cdc.gov/coronavirus/2019-ncov/more/masking-science-sars-cov2.html" target="_blank">likelihood of infection is low</a>.</p>
Who am I protecting when I wear a mask?<p>In a word: everyone. The coronavirus <a href="https://theconversation.com/aerosols-are-a-bigger-coronavirus-threat-than-who-guidelines-suggest-heres-what-you-need-to-know-142233" target="_blank">spreads through respiratory droplets</a> that you send out into the air when you talk, sing or even just breathe. The tiniest of these droplets can float on air currents for long periods.</p><p>Face masks stop many of those droplets, reducing the amount of virus in the air. That lowers your chances of getting infected, and it also lowers the chances that you'll infect someone else.</p><p><a href="https://www.cdc.gov/coronavirus/2019-ncov/more/masking-science-sars-cov2.html" target="_blank">Studies of people who had prolonged exposure</a> to others with COVID-19 have demonstrated how masks can reduce the chance of the virus spreading. In general, <a href="https://www.cdc.gov/coronavirus/2019-ncov/more/masking-science-sars-cov2.html" target="_blank" rel="noopener noreferrer">well-fitted cloth masks</a> made up of multiple layers can stop most large droplets and at least half of the tiny ones. Plastic <a href="https://doi.org/10.1101/2020.10.05.20207241" target="_blank" rel="noopener noreferrer">face shields</a> alone are far less effective. <a href="https://www.washingtonpost.com/health/2020/08/13/cdc-mask-guidance-masks-valves/" target="_blank" rel="noopener noreferrer">Face masks with valves or vents</a> might be good for construction work, but they don't stop the wearer from breathing out virus into the air.</p>
Can I reuse a mask and when should I replace it?<p>Reusable masks should be kept clean and dry. We're moving into cold and flu season, and noses get drippy. A rule of thumb: Anytime a mask is wet to the point that you can discern the wetness, it's time for a new one if it's disposable, or it's time to clean your reusable mask.</p><p>Wetness allows viruses to more easily move through paper or fabric because it allows the threads to move and may reduce the electrostatic charge in the masks that add extra protection with some fabrics.</p><p>In general, you can use a mask that stays clean and dry for about a week before you need to wash or discard it.</p>
How should I clean a cloth mask?<p>Washing your mask is like washing your clothes. You know when it is time.</p><p>In general, <a href="https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/how-to-wash-cloth-face-coverings.html" target="_blank">cleaning your mask weekly</a> should be sufficient. If odors develop before then, it's a good idea to wash it sooner. Odor generally means bacterial buildup.</p><p>Cleaning your mask by hand with soap and water is your best option. Using a general detergent on a gentle cycle in the washing machine is also fine, but that may increase the risk of damage, depending on the quality of the material. COVID-19 is not a hardy virus. Any soap or detergent should work fine. There's no need for special chemicals, bleach or harsh soaps.</p><p>Be careful to remove any inserts before washing. Inserted filters are generally not washable.</p><p>Air drying masks works best. Remember, masks should be completely dry before use. So be sure to have a replacement mask handy while the one you just washed dries.</p><p>Sunlight is always a great source of heat to dry your mask. Also, sunlight has ultraviolet radiation, which has been shown to <a href="http://doi.org/10.1111/php.13293" target="_blank" rel="noopener noreferrer">eliminate coronavirus</a> and is also known to have antibacterial properties.</p>
Can I wear the mask below my nose?<p>Wearing your mask below your nose is, frankly, ridiculous.</p><p>Think about it. If you are breathing through your nose and only covering your mouth, you are effectively eliminating the point of the mask. Properly wearing a mask requires covering both your nose and mouth at all times.</p><p>Studies show that wearing a proper cloth mask or surgical mask while exercising <a href="http://doi.org/10.1513/AnnalsATS.202008-990CME" target="_blank">doesn't affect the flow of oxygen</a> or carbon dioxide in any detectable way. So, unless you have serious heart and lung problems, that isn't an excuse.</p>
How do I safely remove my mask if I’m going to eat or drink?<p>When you <a href="https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/how-to-wash-cloth-face-coverings.html" target="_blank">take your mask off</a>, remove it carefully by the straps without touching anything else and put it somewhere safe, like wrapped in paper in a purse, bag or pocket. Then wash your hands or use hand sanitizer. When you put it back on, wash your hands again.</p>
So, how can I have a safe holiday gathering?<p>The safest way to celebrate this year is to do so with members only within your household. The <a href="https://www.cdc.gov/coronavirus/2019-ncov/daily-life-coping/holidays.html" target="_blank" rel="noopener noreferrer">CDC is now stressing that point</a>, as well. If you do celebrate with friends and relatives from outside your household, you need an action plan to reduce the risk of exposure.</p><p>Here are five recommendations:</p><ul><li>Limit the number of people – fewer people means fewer opportunities for exposure, and you'll have more room to spread out.</li><li>Require masks when not eating or drinking.</li><li>Use physical distancing when eating. Try to seat people <a href="https://doi.org/10.1136/bmj.m3223" target="_blank" rel="noopener noreferrer">at least 6 feet apart</a>. Eat outside if you can.</li><li>Consider being tested for COVID-19 before traveling or gathering. It's not a guarantee, but it can help flag illnesses. Remember to self-isolate between the test and the event.</li><li>Be prepared to self-isolate for 14 days after traveling or participating in any event that involves people from outside your home.</li></ul><p>[<em>Research into coronavirus and other news from science</em> <a href="https://theconversation.com/us/newsletters/science-editors-picks-71/?utm_source=TCUS&utm_medium=inline-link&utm_campaign=newsletter-text&utm_content=science-corona-research" target="_blank" rel="noopener noreferrer">Subscribe to The Conversation's new science newsletter</a>.]</p><p><em>The map has been updated with New Hampshire announcing a mask mandate effective Nov. 20.</em></p><p><em>Jason Farley is a professor, infectious disease-trained epidemiologist and nurse practitioner at the Johns Hopkins University School of Nursing.<br></em></p><p><em>Disclosure statement: Jason Farley, PhD, MPH, ANP-BC, FAAN receives funding from the National Institutes of Health on the Rapid Acceleration of Diagnostics for COVID-19 and Becton Dickinson for studies on SARS-CoV-2 diagnostics.</em></p><p><em>Reposted with permission from <a href="https://theconversation.com/why-face-masks-belong-at-your-thanksgiving-gathering-7-things-you-need-to-know-about-wearing-them-150130" target="_blank">The Conversation</a>. </em></p>
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