Kinetic Energy-Harvesting Shoes Could Charge Your Smartphone or Be Wi-Fi Hot Spot
Mechanical engineers at the University of Wisconsin-Madison have developed electricity-generating footwear that lets you charge mobile electronic devices simply by walking.
As it turns out, “human walking carries a lot of energy,” as UW-Madison mechanical engineering associate professor Tom Krupenkin said in a university news release.
“Theoretical estimates show that it can produce up to 10 watts per shoe, and that energy is just wasted as heat," Krupenkin continued. "A total of 20 watts from walking is not a small thing, especially compared to the power requirements of the majority of modern mobile devices.” A typical smartphone, for instance, requires less than two watts.
As the news release points out, the shoes could be especially useful for the military as soldiers have to carry heavy electronics such as flashlights, night vision devices, GPS and many pounds of batteries on top of that.
The shoes could also be a source of electricity to people living in developing countries where access to reliable power sources can be difficult.
In the video below, Krupenkin uses the shoes to directly power an LED flashlight.
There are already many other power-generating-shoe concepts, but successfully pulling it off for the market is quite the difficult task. That's because "traditional approaches to energy harvesting and conversion don’t work well for the relatively small displacements and large forces of footfalls," according to the researchers.
However, by using a process called “reverse electrowetting,” a phenomenon that Krupenkin and senior scientist J. Ashley Taylor pioneered in 2011, a conductive liquid interacts with a nanofilm-coated surface and the mechanical energy is directly converted into electrical energy.
This method can generate an electrical charge but it requires a high-frequency energy source such as a quickly vibrating or rotating motor.
To solve this problem, the researchers came up with the so-called “bubbler” method which combines reverse electrowetting with the growth and pop of, yes, bubbles.
According to the news release:
The researchers’ bubbler device—which contains no moving mechanical parts—consists of two flat plates separated by a small gap filled with a conductive liquid. The bottom plate is covered with tiny holes through which pressurized gas forms bubbles. The bubbles grow until they’re large enough to touch the top plate, which causes the bubble to collapse.
The speedy, repetitive growth and collapse of bubbles pushes the conductive fluid back and forth, generating electrical charge.
“The high frequency that you need for efficient energy conversion isn’t coming from your mechanical energy source but instead, it’s an internal property of this bubbler approach,” Krupenkin said.
“The bubbler really shines at producing high power densities. For this type of mechanical energy harvesting, the bubbler has a promise to achieve by far the highest power density ever demonstrated.”
According to the engineers, their harvester can be integrated with a broad range of electronic devices embedded in a shoe, such as a Wi-Fi hot spot that acts as a “middleman” between mobile devices and a wireless network. This process "requires no cables, dramatically cuts the power requirements of wireless mobile devices and can make a cellphone battery last 10 times longer between charges," they noted.
Krupenkin and Taylor and their startup company, InStep NanoPower, is currently seeking to partner with industry and commercialize a footwear-embedded energy harvester.
The research team published their findings in a paper on Nov. 16, 2015 in the journal Scientific Reports. Additional authors on the s paper include UW-Madison mechanical engineering graduate students Tsung-Hsing Hsu and Supone Manakasettharn.
Learn more about the footwear in the video below.
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Swedish climate activist Greta Thunberg protests during a "Fridays for Future" protest in front of the Swedish Parliament Riksdagen in Stockholm on October 9. Jonathan Nackstrand / AFP / Getty Images
By Greta Thunberg
- Greta Thunberg calls for urgent action to address the climate and ecological crisis.
- She reminds the world of the promises made to children and grandchildren — a promise they expect to be kept.
- The proposals being discussed and presented at the moment are 'very far from being enough.'
<ul class="ee-ul"></ul><p>My name is Greta Thunberg and I'm not here to make deals. You see, I don't belong to any financial interest or political party. So I can't bargain or negotiate. I am only here to once again remind you of the emergency we're in. The crisis that you and your predecessors have created and inflicted upon us. The crisis that you continue to ignore.</p>
<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="10605be96f226155a2e82011293d251f"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/KjRDUlkEbu4?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span><p>I am here to remind you of the promises that you have made to your children and grandchildren. And to tell you that we are not willing to compromise on the very minimum safety levels that still remain.</p><p>The climate and ecological crisis can unfortunately no longer be solved within today's systems. According to the current best available science that is no longer an opinion; that's a fact.</p><p>We need to keep this in mind as countries, businesses and investors now rush forward to present their new so-called "ambitious" climate targets and commitments. The longer we avoid this uncomfortable truth, and the longer we pretend we can solve the climate - and ecological emergency — without treating it like a crisis — the more precious time we will lose. And this is time we do not have.</p>
<p>Today, we hear leaders and nations all over the world speak of an "existential climate emergency". But instead of taking the immediate action you would in any emergency, they set up vague, insufficient, hypothetical targets way into the future, like "net-zero 2050." Targets based on loopholes and incomplete numbers. Targets that equal surrender. It's like waking up in the middle of the night, seeing your house on fire, then deciding to wait 10, 20 or 30 years before you call the fire department while labeling those trying to wake people up alarmists.</p><p>We understand that the world is very complex and that change doesn't happen overnight. But you've now had more than three decades of bla bla bla. How many more do you need? Because when it comes to facing the climate and ecological emergency, the world is still in a state of complete denial. The justice for the most affected people in the most affected areas is being systematically denied.</p><p>Even though we welcome every single climate initiative, the proposals being presented and discussed today are very far from being enough. And the time for "small steps in the right direction" is long gone. If we are to have at least a small chance of avoiding the worst consequences of the climate and ecological crisis, this needs to change.</p><p>Because you still say one thing, and then do the complete opposite. You speak of saving nature, while locking in policies of further destruction for decades to come.</p><p>You promise to not let future generations down, while creating new loopholes, failing to connect the dots, building your so called "pledges" on the cheating tactics that got us into this mess in the first place. If the commitments of lowering all our emissions by 70, 68 or even 55 percent by 2030 actually meant they aim to reduce them by those figures then that would be a great start. But that is unfortunately not the case.</p><p>And since the level of public awareness continues to be so low our leaders can still get away with almost anything. No one is held accountable. It's like a game. Whoever is best at packaging and selling their message wins.</p><p>As it is now, we can have as many summits and meetings as we want, but unless we treat the climate and ecological crisis like a crisis, no sufficient changes will be achieved. What we need — to begin with — is to implement annual binding carbon budgets based on the current best available science.</p>
<p>Right now more than ever we are desperate for hope. But what is hope? For me hope is not more empty assurances that everything will be alright, that things are being taken care of and we do not need to worry.</p><p>For me, hope is the feeling that keeps you going, even though all odds may be against you. For me hope comes from action not just words. For me, hope is telling it like it is. No matter how difficult or uncomfortable that may be.</p><p>And again, I'm not here to tell you what to do. After all, safeguarding the future living conditions and preserving life on earth as we know it is voluntary. The choice is yours to make.</p><p>But I can assure you this. You can't negotiate with physics. And your children and grandchildren will hold you accountable for the choices that you make. How's that for a deal?</p>
<ul class="ee-ul"></ul><p><em>Reposted with permission from </em><em><a href="https://www.weforum.org/agenda/2021/01/greta-thunberg-message-to-the-davos-agenda/" target="_blank">World Economic Forum</a>.</em><a href="https://www.ecowatch.com/r/entryeditor/2650141679#/" target="_self"></a></p>From Your Site Articles
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A dugong, also called a sea cow, swims with golden pilot jacks near Marsa Alam, Egypt, Red Sea. Alexis Rosenfeld / Getty Images
In 2010, world leaders agreed to 20 targets to protect Earth's biodiversity over the next decade. By 2020, none of them had been met. Now, the question is whether the world can do any better once new targets are set during the meeting of the UN Convention on Biodiversity in Kunming, China later this year.
<p>To help turn the tide, a group of 22 research institutions have come together to develop four steps to protect life on Earth, the <a href="https://environmentjournal.online/articles/researchers-outline-four-key-steps-to-mitigate-climate-crisis/" rel="noopener noreferrer" target="_blank">Environment Journal reported</a>.</p>
<p>"The upcoming Convention on Biological Diversity (CBD) meeting, and adoption of the new Global Biodiversity Framework, represent an opportunity to transform humanity's relationship with nature," the researchers wrote in <a href="https://www.cell.com/one-earth/fulltext/S2590-3322(20)30657-6?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS2590332220306576%3Fshowall%3Dtrue" target="_blank">One Earth Friday</a>. "Restoring nature while meeting human needs requires a bold vision, including mainstreaming biodiversity <a href="https://www.ecowatch.com/tag/conservation" target="_self">conservation</a> in society."</p><p>By mainstreaming biodiversity, the researchers mean that biodiversity should be considered by everyone who makes decisions about the use of natural resources, not just specialized conservation organizations.</p>
<p>To help with this goal, the researchers, led by the University of Oxford's <a href="https://www.iccs.org.uk/" rel="noopener noreferrer" target="_blank">Interdisciplinary Centre for Conservation Science</a>, developed a framework they are calling the "4Rs," according to a University of Oxford <a href="https://www.ox.ac.uk/news/2021-01-22-four-steps-earth-holistic-approach-saving-planet" rel="noopener noreferrer" target="_blank">press release</a>. The point of the 4Rs is that they can be used by any group or individual, from the national to the local level, that needs to make a decision that will impact species and ecosystems.</p><p>The 4Rs are:</p><ol><li>Refrain: Avoiding negative impacts on nature.</li><li>Reduce: Minimizing the harm caused by any unavoidable impacts.</li><li>Restore: Acting to quickly counteract any harm caused to nature.</li><li>Renew: Working to improve damaged ecosystems.</li></ol>
<p>"This paper represents a real team effort, with authors from academia, business and government," lead author and Oxford professor E.J. Milner-Gulland said of the goals in the press release. "We're excited to launch this idea and hope that it will be useful to many different groups as they work to realise the vision of the post-2020 Global Biodiversity Framework. It's a huge challenge, with many different facets, and we hope that Four Steps for the Earth will provide an intuitive and flexible framework for tying all the threads together."</p>
<p>In the paper, the researchers provided examples of how the framework has been used by groups ranging from the city of London to Indigenous communities. In one example, a fishery in Peru used it to reduce the accidental catching of sea turtles. Goals were set for limiting the number of different species of sea turtle accidentally caught at the local level, and this was connected to regional conservation efforts for the animals.</p><p>The researchers also explained how different institutions could use their framework to guide their actions in the future.</p><p>"This framework will, hopefully, present a turning point in the way institutions such as Oxford think about their biodiversity impact," Oxford project coordinator Henry Grub said in the press release. "Our impacts cannot be overlooked because of the positive research we do – rather we hope the '4Rs' will transform efforts to tackle the environmental impacts of the food we eat in canteens, the paper we put in printers, the land we build on, and much more."</p>
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President Joe Biden signs executive orders in the State Dining Room at the White House on Jan. 22, 2021 in Washington, DC. Jabin Botsford / The Washington Post via Getty Images
By Andrew Rosenberg
The first 24 hours of the administration of President Joe Biden were filled not only with ceremony, but also with real action. Executive orders and other directives were quickly signed. More actions have followed. All consequential. Many provide a basis for not just undoing actions of the previous administration, but also making real advances in public policy to protect public health, safety, and the environment.
<p><br/></p>
<p>These first executive orders address huge challenges — the <a href="https://www.washingtonpost.com/health/biden-coronavirus-executive-actions/2021/01/21/9a4ab954-5b56-11eb-8bcf-3877871c819d_story.html" target="_blank" rel="noopener noreferrer">pandemic</a>, <a href="https://ucsusa.org/about/news/biden-expected-rejoin-paris-agreement-day-one-bring-us-back-international-fold" target="_blank" rel="noopener noreferrer">climate change</a>, <a href="https://www.whitehouse.gov/briefing-room/presidential-actions/2021/01/20/executive-order-advancing-racial-equity-and-support-for-underserved-communities-through-the-federal-government/" target="_blank" rel="noopener noreferrer">racial justice</a>, and <a href="https://www.whitehouse.gov/briefing-room/statements-releases/2021/01/22/fact-sheet-president-bidens-new-executive-actions-deliver-economic-relief-for-american-families-and-businesses-amid-the-covid-19-crises/" target="_blank" rel="noopener noreferrer">economic</a> uncertainty. Among these actions, President Biden also issued a critically important order on "<a href="https://www.whitehouse.gov/briefing-room/presidential-actions/2021/01/20/executive-order-protecting-public-health-and-environment-and-restoring-science-to-tackle-climate-crisis/" target="_blank" rel="noopener noreferrer">Protecting Public Health and the Environment and Restoring Science to Tackle the Climate Crisis</a>," which includes some provisions that have received much less attention than they warrant. They go to the heart of much of UCS' work and advocacy.</p>
<p>Section 1 of the order is clear and inspiring:</p><p>"Policy. Our Nation has an abiding commitment to empower our workers and communities; promote and protect our public health and the environment; and conserve our national treasures and monuments, places that secure our national memory. Where the Federal Government has failed to meet that commitment in the past, it must advance environmental justice. In carrying out this charge, the Federal Government must be guided by the best science and be protected by processes that ensure the integrity of Federal decision-making. <em>It is, therefore, the policy of my Administration to listen to the science; to improve public health and protect our environment; to ensure access to clean air and water; to limit exposure to dangerous chemicals and pesticides; to hold polluters accountable, including those who disproportionately harm communities of color and low-income communities; to reduce greenhouse gas emissions; to bolster resilience to the impacts of climate change; to restore and expand our national treasures and monuments; and to prioritize both environmental justice and the creation of the well-paying union jobs necessary to deliver on these goals."</em> (emphasis added)</p>
<p>Music to my ears. Listening to the <a href="http://www.ecowatch.com/science/">science</a> is not just about the pandemic, it is about serving the needs of the public. For protecting public health and safety in our communities. For worker safety. For protections for all with justice and equity, particularly communities of color and low-income communities that have long suffered much of the burden of pollution and environmental harms. These are exactly the <a href="https://ucsusa.org/resources/roadmap-science-decisionmaking" target="_blank" rel="noopener noreferrer">changes</a> that UCS has been advocating for and will pay enormous dividends in improving public health and safety, with specific attention to ensuring those benefits are for all communities.</p><p>As ordered by our president, all agencies and departments in the Executive Branch must immediately review and address actions taken between January 20, 2017 and January 20,2021 that conflict with these policy goals. And suspend, revise, or rescind those found to be in conflict with the new president's policy goals as soon as possible.</p>
<p>For example, these actions will include, but are not limited to:</p><ul><li>Reversing the climate- and health-harming rollback of <a href="https://blog.ucsusa.org/julie-mcnamara/epa-methane-rollbacks-natural-gas-bridge-becomes-piece-of-crumbling-infrastructure" target="_blank">methane emissions</a> standards.</li><li>Redoing the fuel economy and emissions standards for cars and light trucks that were <a href="https://blog.ucsusa.org/dave-cooke/trump-administration-finalizes-car-rule-which-will-worsen-economy-public-health" target="_blank" rel="noopener noreferrer">gutted</a> under the <a href="https://blog.ucsusa.org/dave-cooke/trump-administration-finalizes-car-rule-as-handout-to-fossil-fuel-industry" target="_blank" rel="noopener noreferrer">last administration</a>, while also moving forward with <a href="https://blog.ucsusa.org/dave-cooke/under-biden-administration-a-new-decade-has-dawned-passenger-car-regulations-must-keep-up?_ga=2.51189737.1374580234.1611258477-310247935.1607440719" target="_blank" rel="noopener noreferrer">ambitious standards</a> that will dramatically reduce emissions and increase transportation electrification in the future.</li><li>Reconsidering rollbacks of <a href="https://blog.ucsusa.org/julie-mcnamara/while-you-werent-looking-energy-efficiency-became-one-of-our-nations-top-energy-resources" target="_blank" rel="noopener noreferrer">energy efficiency standards</a>.</li><li>Undoing attacks on <a href="https://blog.ucsusa.org/julie-mcnamara/epas-brazen-mercury-rule-proposal" target="_blank" rel="noopener noreferrer">mercury and air toxics</a> standards for coal plants.</li><li>Reconsidering changes to the way <a href="https://blog.ucsusa.org/julie-mcnamara/manipulation-of-benefit-cost-analysis-hides-bodies-in-the-fine-print" target="_blank" rel="noopener noreferrer">costs and benefits</a> are calculated.</li><li>Revoking the rule that <a href="https://ucsusa.org/about/news/epa-rule-restricting-science-puts-agencys-mission-risk-0" target="_blank" rel="noopener noreferrer">limits the science</a> that the EPA can use in rulemaking.</li><li>Reestablishing the interagency working group on the "<a href="https://blog.ucsusa.org/rachel-cleetus/the-social-cost-of-carbon-underscores-an-obvious-fact-climate-change-is-costly" target="_blank" rel="noopener noreferrer">social cost</a> of greenhouse gas emissions to determine the social benefits of limiting global warming as critical input to evaluating regulatory proposals, and requiring an interim SCC, SCN and SCM within 30 days which will be used until final values are published.</li><li>Erasing the shortcutting of <a href="https://blog.ucsusa.org/derrick-jackson/environmental-racism-in-action-the-trump-administrations-plans-to-gut-nepa" target="_blank" rel="noopener noreferrer">environmental reviews</a> of federal projects under the National Environmental Policy Act (NEPA).</li></ul><p>Within 30 days agencies must submit a full list of actions from the last four years that will be considered for review and revision or cancellation within the next year.</p>
<h3>(Measured) Excitement at UCS</h3><p>I danced around the room with my dogs at the push toward restoring NEPA analyses. Doing a thorough NEPA analysis, which the shortcuts held back, means that agencies must seek public input more extensive than just notice and public comment during the rulemaking process. And critically it means that alternatives to a proposed action must be considered and vetted with the public, with the full analysis available to anyone who wants to understand the ramifications of a particular policy action. That includes, now with the new order, considering the impacts of climate change and on environmental justice. We need these analyses and public discussion — they are a key part of decisionmaking in our constitutional democracy.</p><p>I am definitely not the only one at UCS who gets excited by these wonky, technical pronouncements.</p><p>My colleague <a href="https://blog.ucsusa.org/author/jonna-hamilton" target="_blank" rel="noopener noreferrer">Jonna Hamilton</a> raised a glass to toast the drive to more ambitious fuel economy and emissions standards, saying it's time to ensure that the auto companies make the next generation of vehicles that consumers want to drive. Strong standards will help the transition to electric vehicles, which <a href="https://blog.ucsusa.org/dave-reichmuth/are-electric-vehicles-really-better-for-the-climate-yes-heres-why" target="_blank" rel="noopener noreferrer">reduce emissions</a>, no matter where they are charged.</p><p><a href="https://blog.ucsusa.org/author/rachel-cleetus" target="_blank" rel="noopener noreferrer">Rachel Cleetus</a> breathed a sigh of relief that the government will be restoring the use of the social cost of carbon (and the social cost of methane and the social cost of nitrous oxide) for regulatory purposes. And that the Council on Environmental Quality will be updating its guidance on the consideration of greenhouse gases for NEPA analyses. With <a href="https://blog.ucsusa.org/brenda-ekwurzel/2020-ends-hottest-decade-on-record-decadal-temperature-chart-as-iconic-as-co2-keeling-curve" target="_blank" rel="noopener noreferrer">2020 ending the hottest decade on record</a> globally, and bringing a record-breaking <a href="https://www.noaa.gov/stories/record-number-of-billion-dollar-disasters-struck-us-in-2020" target="_blank" rel="noopener noreferrer">22 extreme weather and climate related disasters</a> in the US that killed at least 262 people and each cost more than a billion dollars, it's high time we took the costs of climate change seriously!</p><p>And <a href="https://blog.ucsusa.org/author/gretchen-goldman" target="_blank" rel="noopener noreferrer">Gretchen Goldman</a>, swinging her young sons in the air in joy, was thrilled to see that revoking the limits on science was named as a top priority of the Biden administration! The so-called Transparency Rule would do <a href="https://ucsusa.org/about/news/epa-rule-restricting-science-puts-agencys-mission-risk-0" target="_blank" rel="noopener noreferrer">widespread damage</a> to the EPA's ability to use the best available science on everything from air pollution standards to pesticide regulation. Finding a way to get rid of <a href="https://undark.org/2019/11/21/opinion-trump-epa-transparency-rule/" target="_blank" rel="noopener noreferrer">this harmful rule</a> will allow the EPA to fully carry out its mission of protecting public health and the environment.</p><p>This order does a lot more to revoke bad policies. It also calls on the Secretary of the Interior to review the <a href="http://www.ecowatch.com/tag/national-monuments">national monuments</a> with a view to restoring them to 2017 boundaries. It declares the environmental review of oil and gas leasing in the Arctic National Wildlife Refuge inadequate, placing a moratorium on leasing. It revokes the permit for the Keystone XL pipeline because it is inconsistent with the economic and climate goals of the new administration. And part of those stated goals as laid out in the policy section of the order includes respecting the voices of the Indigenous communities whose lands, livelihoods, and culture were given short shrift in the permitting process to date.</p>
<h3>Another Less Noticed, Even Wonkier, Remarkable Day One Action</h3><p>Another <a href="https://www.whitehouse.gov/briefing-room/presidential-actions/2021/01/20/modernizing-regulatory-review/" target="_blank" rel="noopener noreferrer">Presidential Directive</a> of critical importance to the mission and work of UCS is titled "Modernizing Regulatory Review." It calls for the Office of Management and Budget, through its Office of Information and Regulatory Affairs (OIRA), to re-focus the role and content of reviews of regulations proposed by federal agencies.</p><p>The new process OIRA is tasked with designing and implementing in consultation with agencies across the government will:</p><ul><li>Reflect new developments in science.</li><li>Fully account for benefits of regulations that are difficult to quantify.</li><li>Take into account the distributional consequences of regulations to ensure they appropriately benefit, and not inappropriately burden, disadvantaged, vulnerable or marginalized communities.</li><li>Find ways for OIRA to work more proactively and effectively with agencies to obtain the benefits to the public that come with regulatory initiatives.</li><li>Improve efficiency, transparency, and inclusiveness in the interagency review process.</li></ul><p>For example, consider the review of the previous administration's rules that would limit the science that the EPA can use as the basis for implementing public health protections. That rule requires that the underlying data of any study be publicly available to be fully considered by the agency. That would necessarily exclude studies that rely on confidential health information in most cases, or give those studies lower credence, not on the basis of their scientific merit, but because of an artificial barrier labeled as "transparency" concerns. <a href="https://blog.ucsusa.org/genna-reed/we-told-omb-why-epas-so-called-transparency-rule-is-a-trap" target="_blank" rel="noopener noreferrer">OIRA has reviewed</a> both the proposed and final rules and deemed them not economically significant, despite the fact that they affect all of the work that EPA does. Under an improved review process, the rule would have never moved through the process because it will in fact overburden, yet again, vulnerable communities.</p><p>Though OIRA's work is often behind the scenes and rarely fully acknowledged, the agency plays a critical role in either advancing or hindering the regulatory process. In order for the Biden administration to meet its goals on climate, the pandemic, racial justice, and economic recovery, that process has to become better and more effective. OIRA involvement must add real value to the benefit of the public. It is heartening and remarkable that this directive is a Day One action of the new administration.</p>
<h3>Toward Real Action</h3><p>By no means do the first executive orders accomplish the huge tasks before this administration. But it is an extraordinarily good start.</p><p>Now these orders need to turn into real actions from top to bottom in the federal government and in partnership with state and tribal governments as well as internationally. None of the challenges we face will be solved without action at all levels.</p><p>Our excitement at UCS is tempered by the enormous amount of work that needs to turn this promising vision into a reality. We will make our voices heard to hold the administration and Congress to account. Please join us in doing so.</p>
<p><em>Andrew Rosenberg is the director of the UCS Center for Science and Democracy.</em></p><p><em>Reposted with permission from <a href="https://blog.ucsusa.org/andrew-rosenberg/consequential-biden-actions-nobody-is-talking-about" target="_blank">Union of Concerned Scientists</a>.</em></p>From Your Site Articles
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Melting ice forms a lake on free-floating ice jammed into the Ilulissat Icefjord during unseasonably warm weather on July 30, 2019 near Ilulissat, Greenland. Sean Gallup / Getty Images
A first-of-its-kind study has examined the satellite record to see how the climate crisis is impacting all of the planet's ice.
<p>The answer? Quite a lot. The rate of worldwide ice loss has increased by more than 60 percent in the past three decades, a study published in <a href="https://tc.copernicus.org/articles/15/233/2021/" target="_blank">The Cryosphere</a> on Monday found.</p><p>"The ice sheets are now following the worst-case climate warming scenarios set out by the Intergovernmental Panel on Climate Change," Dr. Thomas Slater, study lead author and research fellow at Leeds' <a href="https://cpom.org.uk/" target="_blank">Center for Polar Observation and Modeling</a>, said in a <a href="http://www.leeds.ac.uk/news/article/4756/global_ice_loss_increases_at_record_rate" rel="noopener noreferrer" target="_blank">University of Leeds press release</a>. "<a href="https://www.ecowatch.com/tag/sea-level-rise" target="_self">Sea-level rise</a> on this scale will have very serious impacts on coastal communities this century."</p><p>Previous studies have used satellite data to assess ice loss from individual sources, such as polar ice caps, <a href="https://www.theguardian.com/environment/2021/jan/25/global-ice-loss-accelerating-at-record-rate-study-finds" rel="noopener noreferrer" target="_blank">The Guardian explained</a>. However, this is the first one to consider all sources of ice loss. The study found that the world lost around 31 trillion U.S. tons between 1994 and 2017. During that time, the rate of ice loss also increased 65 percent, from 0.9 trillion U.S. tons a year to 1.4 trillion U.S. tons a year. Ice loss from <a href="https://www.ecowatch.com/tag/ice-sheets" target="_self">ice sheets</a> in <a href="https://www.ecowatch.com/tag/antarctica" target="_self">Antarctica</a> and <a href="https://www.ecowatch.com/tag/greenland" target="_self">Greenland</a> largely contributed to that number, the press release stated.</p>
<p>The paper also broke down which sources had lost the most ice in total terms between 1994 and 2017. Amounts are approximate and in U.S. tons:</p><ol><li><a href="https://www.ecowatch.com/tag/arctic" target="_self">Arctic</a> <a href="https://www.ecowatch.com/tag/sea-ice" target="_self">sea ice</a>: 8.4 trillion</li><li>Antarctic ice shelves: 7.2 trillion</li><li>Mountain <a href="https://www.ecowatch.com/tag/glaciers" target="_self">glaciers</a>: 6.7 trillion</li><li>Greenland ice sheet: 4.2 trillion</li><li>Antarctic ice sheet: 2.8 trillion</li><li>Southern Ocean sea ice: one trillion</li></ol><p>The study also examined the leading cause of ice melt for each source, according to the press release. For Arctic sea ice and mountain glaciers, rising atmospheric temperatures have driven melting. For the Antarctic ice sheet, rising <a href="https://www.ecowatch.com/tag/oceans" target="_self">ocean</a> temperatures have been the main cause. And for the Greenland ice sheet and Antarctic ice shelves, melting has been increased by a combination of the two.</p><p>All told, melting from Antarctica, Greenland and mountain glaciers have increased sea levels by around 34.6 millimeters, the study found. While this might not sound like a lot, every centimeter of sea level rise puts around a million people in low-lying areas at risk of being flooded out of their homes, the press release said. Moreover, sea level rise isn't the only threat from melting ice.</p><p>"As well as contributing to global mean sea level rise, mountain glaciers are also critical as a freshwater resource for local communities," Inès Otosaka, report co-author and Leeds PhD researcher, said in the press release. "The retreat of glaciers around the world is therefore of crucial importance at both local and global scales."</p>
<p>Melting Arctic sea ice is also a problem because it reduces the ice cover that reflects solar energy back into space.</p><p>"As the sea ice shrinks, more solar energy is being absorbed by the oceans and atmosphere, causing the Arctic to warm faster than anywhere else on the planet," Dr. Isobel Lawrence, coauthor and Leeds research fellow, explained in the press release. "Not only is this speeding up sea ice melt, it's also exacerbating the melting of glaciers and ice sheets which causes sea levels to rise."</p><p>Climate scientist Gavin Schmidt, who was not involved in the study, <a href="https://twitter.com/ClimateOfGavin/status/1353682889045667840" target="_blank">called it</a> a "thorough accounting of how ice is disappearing from the Arctic, Antarctic and mountain ranges."</p><p>However, he disagreed with the paper's claim that the melting of floating sea ice does not contribute directly to sea level rise. He pointed to a <a href="https://academic.oup.com/gji/article/170/1/145/2019346" rel="noopener noreferrer" target="_blank">2007 paper</a> that found that if all currently floating sea ice were to melt, sea levels would rise around four centimeters. Slater <a href="https://twitter.com/_tslater/status/1353716525170098176" rel="noopener noreferrer" target="_blank">agreed</a> that the language should be changed to make it clear that melting floating sea ice does slightly contribute to sea level rise.</p>
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A Healthy Microbiome Builds a Strong Immune System That Could Help Defeat COVID-19
23h
Health + Wellness
Probiotic rich foods. bit245 / iStock / Getty Images Plus
By Ana Maldonado-Contreras
Takeaways
- Your gut is home to trillions of bacteria that are vital for keeping you healthy.
- Some of these microbes help to regulate the immune system.
- New research, which has not yet been peer-reviewed, shows the presence of certain bacteria in the gut may reveal which people are more vulnerable to a more severe case of COVID-19.
You may not know it, but you have an army of microbes living inside of you that are essential for fighting off threats, including the virus that causes COVID-19.
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In the past two decades scientists have learned our bodies are home to more bacterial cells than human ones. This community of bacteria that lives in and on us – called the microbiome – resembles a company, with each microbe species performing specialized jobs but all working to keep us healthy. In the gut, the bacteria balance the immune response against pathogens. These bacteria ensure the immune response is effective but not so violent that it causes collateral damage to the host.
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Bacteria in our guts can elicit an effective immune response against viruses that not only infect the gut, such as <a href="http://doi.org/10.3390/v10020096" target="_blank">norovirus</a> <a href="http://doi.org/10.1126/science.1258025" rel="noopener noreferrer" target="_blank">and rotavirus</a>, but also those infecting the lungs, such as <a href="https://doi.org/10.1073/pnas.1019378108" rel="noopener noreferrer" target="_blank">the flu virus</a>. The beneficial gut microbes do this by ordering specialized immune cells to produce potent antiviral proteins that ultimately eliminate <a href="https://doi.org/10.1016/j.cell.2020.04.022" rel="noopener noreferrer" target="_blank">viral infections</a>. And the body of a person lacking these beneficial gut bacteria won't have as strong an immune response to invading viruses. As a result, infections might go unchecked, taking a toll on health.
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<p><a href="https://scholar.google.com/citations?user=4y55zc0AAAAJ&hl=en" target="_blank" rel="noopener noreferrer">I am a microbiologist</a> fascinated by the ways bacteria shape human health. <a href="https://www.umassmed.edu/nutrition/melody-trial-info/" target="_blank" rel="noopener noreferrer">An important focus of my research</a> is figuring out how the beneficial bacteria populating our guts combat disease and infection. <a href="https://doi.org/10.1101/2021.01.05.20249061" target="_blank" rel="noopener noreferrer">My most recent work focuses on the link</a> between a particular microbe and the severity of COVID-19 in patients. My ultimate goal is to figure out out how to enhance the gut microbiome with diet to evoke a strong immune response – for not just SARS-CoV-2 but all pathogens.</p>
How Do Resident Bacteria Keep You Healthy?
<p>Our immune defense is part of a complex biological response against harmful pathogens, such as viruses or bacteria. However, because our bodies are inhabited by trillions of mostly beneficial bacteria, virus and fungi, activation of our immune response is tightly regulated to distinguish between harmful and helpful microbes.</p><p>Our bacteria are spectacular companions diligently helping prime our immune system defenses to combat infections. A seminal study found that mice treated with antibiotics that eliminate bacteria in the gut exhibited an impaired immune response. These animals had low counts of virus-fighting white blood cells, weak antibody responses and poor production of a protein that is vital for <a href="https://doi.org/10.1073/pnas.1019378108" target="_blank">combating viral infection and modulating the immune response</a>.</p><p><a href="https://doi.org/10.1371/journal.pone.0184976" target="_blank" rel="noopener noreferrer">In another study</a>, mice were fed <em>Lactobacillus</em> bacteria, commonly used as probiotic in fermented food. These microbes reduced the severity of influenza infection. The <em>Lactobacillus</em>-treated mice did not lose weight and had only mild lung damage compared with untreated mice. Similarly, others have found that treatment of mice with <em>Lactobacillus</em> protects against different <a href="https://doi.org/10.1038/srep04638" target="_blank" rel="noopener noreferrer">subtypes of</a> <a href="https://doi.org/10.1038/s41598-017-17487-8" target="_blank" rel="noopener noreferrer">influenza</a> <a href="https://doi.org/10.1371/journal.ppat.1008072" target="_blank" rel="noopener noreferrer">virus</a> and human respiratory syncytial virus – the <a href="https://doi.org/10.1038/s41598-019-39602-7" target="_blank" rel="noopener noreferrer">major cause of viral bronchiolitis and pneumonia in children</a>.</p>Chronic Disease and Microbes
<p>Patients with chronic illnesses including Type 2 diabetes, obesity and cardiovascular disease exhibit a hyperactive immune system that fails to recognize a harmless stimulus and is linked to an altered gut microbiome.</p><p>In these chronic diseases, the gut microbiome lacks bacteria that activate <a href="https://doi.org/10.1126/science.1198469" target="_blank" rel="noopener noreferrer">immune cells</a> that block the response against harmless bacteria in our guts. Such alteration of the gut microbiome is also observed in <a href="https://doi.org/10.1073/pnas.1002601107" target="_blank" rel="noopener noreferrer">babies delivered by cesarean section</a>, individuals consuming a poor <a href="https://doi.org/10.1038/nature12820" target="_blank" rel="noopener noreferrer">diet</a> and the <a href="https://doi.org/10.1038/nature11053" target="_blank" rel="noopener noreferrer">elderly</a>.</p><p>In the U.S., 117 million individuals – about half the adult population – <a href="https://health.gov/our-work/food-nutrition/2015-2020-dietary-guidelines/guidelines/" target="_blank" rel="noopener noreferrer">suffer from Type 2 diabetes, obesity, cardiovascular disease or a combination of them</a>. That suggests that half of American adults carry a faulty microbiome army.</p><p>Research in my laboratory focuses on identifying gut bacteria that are critical for creating a balanced immune system, which fights life-threatening bacterial and viral infections, while tolerating the beneficial bacteria in and on us.</p><p>Given that diet affects the diversity of bacteria in the gut, <a href="https://www.umassmed.edu/nutrition/melody-trial-info/" target="_blank" rel="noopener noreferrer">my lab studies show how diet can be used</a> as a therapy for chronic diseases. Using different foods, people can shift their gut microbiome to one that boosts a healthy immune response.</p><p>A fraction of patients infected with SARS-CoV-2, the virus that causes COVID-19 disease, develop severe complications that require hospitalization in intensive care units. What do many of those patients have in common? <a href="https://www.cdc.gov/mmwr/volumes/69/wr/mm6912e2.htm" target="_blank" rel="noopener noreferrer">Old age</a> and chronic diet-related diseases like obesity, Type 2 diabetes and cardiovascular disease.</p><p><a href="http://doi.org/10.1016/j.jada.2008.12.019" target="_blank" rel="noopener noreferrer">Black and Latinx people are disproportionately affected by obesity, Type 2 diabetes and cardiovascular disease</a>, all of which are linked to poor nutrition. Thus, it is not a coincidence that <a href="https://www.cdc.gov/mmwr/volumes/69/wr/mm6933e1.htm" target="_blank" rel="noopener noreferrer">these groups have suffered more deaths from COVID-19</a> compared with whites. This is the case not only in the U.S. but also <a href="https://www.washingtonpost.com/world/europe/blacks-in-britain-are-four-times-as-likely-to-die-of-coronavirus-as-whites-data-show/2020/05/07/2dc76710-9067-11ea-9322-a29e75effc93_story.html" target="_blank" rel="noopener noreferrer">in Britain</a>.</p>Discovering Microbes That Predict COVID-19 Severity
<p>The COVID-19 pandemic has inspired me to shift my research and explore the role of the gut microbiome in the overly aggressive immune response against SARS-CoV-2 infection.</p><p>My colleagues and I have hypothesized that critically ill SARS-CoV-2 patients with conditions like obesity, Type 2 diabetes and cardiovascular disease exhibit an altered gut microbiome that aggravates <a href="https://theconversation.com/exercise-may-help-reduce-risk-of-deadly-covid-19-complication-ards-136922" target="_blank" rel="noopener noreferrer">acute respiratory distress syndrome</a>.</p><p>Acute respiratory distress syndrome, a life-threatening lung injury, in SARS-CoV-2 patients is thought to develop from a <a href="http://doi.org/10.1016/j.cytogfr.2020.05.003" target="_blank" rel="noopener noreferrer">fatal overreaction of the immune response</a> called a <a href="https://theconversation.com/blocking-the-deadly-cytokine-storm-is-a-vital-weapon-for-treating-covid-19-137690" target="_blank" rel="noopener noreferrer">cytokine storm</a> <a href="http://doi.org/10.1016/S2213-2600(20)30216-2" target="_blank" rel="noopener noreferrer">that causes an uncontrolled flood</a> <a href="http://doi.org/10.1016/S2213-2600(20)30216-2" target="_blank" rel="noopener noreferrer">of immune cells into the lungs</a>. In these patients, their own uncontrolled inflammatory immune response, rather than the virus itself, causes the <a href="http://doi.org/10.1007/s00134-020-05991-x" target="_blank" rel="noopener noreferrer">severe lung injury and multiorgan failures</a> that lead to death.</p><p>Several studies <a href="https://doi.org/10.1016/j.trsl.2020.08.004" target="_blank" rel="noopener noreferrer">described in one recent review</a> have identified an altered gut microbiome in patients with COVID-19. However, identification of specific bacteria within the microbiome that could predict COVID-19 severity is lacking.</p><p>To address this question, my colleagues and I recruited COVID-19 hospitalized patients with severe and moderate symptoms. We collected stool and saliva samples to determine whether bacteria within the gut and oral microbiome could predict COVID-19 severity. The identification of microbiome markers that can predict the clinical outcomes of COVID-19 disease is key to help prioritize patients needing urgent treatment.</p><p><a href="https://doi.org/10.1101/2021.01.05.20249061" target="_blank" rel="noopener noreferrer">We demonstrated</a>, in a paper which has not yet been peer reviewed, that the composition of the gut microbiome is the strongest predictor of COVID-19 severity compared to patient's clinical characteristics commonly used to do so. Specifically, we identified that the presence of a bacterium in the stool – called <em>Enterococcus faecalis</em>– was a robust predictor of COVID-19 severity. Not surprisingly, <em>Enterococcus faecalis</em> has been associated with <a href="https://doi.org/10.1053/j.gastro.2011.05.035" target="_blank" rel="noopener noreferrer">chronic</a> <a href="https://doi.org/10.1016/S0002-9440(10)61172-8" target="_blank" rel="noopener noreferrer">inflammation</a>.</p><p><em>Enterococcus faecalis</em> collected from feces can be grown outside of the body in clinical laboratories. Thus, an <em>E. faecalis</em> test might be a cost-effective, rapid and relatively easy way to identify patients who are likely to require more supportive care and therapeutic interventions to improve their chances of survival.</p><p>But it is not yet clear from our research what is the contribution of the altered microbiome in the immune response to SARS-CoV-2 infection. A recent study has shown that <a href="https://doi.org/10.1101/2020.12.11.416180" target="_blank" rel="noopener noreferrer">SARS-CoV-2 infection triggers an imbalance in immune cells</a> called <a href="https://doi.org/10.1111/imr.12170" target="_blank" rel="noopener noreferrer">T regulatory cells that are critical to immune balance</a>.</p><p>Bacteria from the gut microbiome are responsible for the <a href="https://doi.org/10.7554/eLife.30916.001" target="_blank" rel="noopener noreferrer">proper activation</a> <a href="https://doi.org/10.1126/science.1198469" target="_blank" rel="noopener noreferrer">of those T-regulatory</a> <a href="https://doi.org/10.1038/nri.2016.36" target="_blank" rel="noopener noreferrer">cells</a>. Thus, researchers like me need to take repeated patient stool, saliva and blood samples over a longer time frame to learn how the altered microbiome observed in COVID-19 patients can modulate COVID-19 disease severity, perhaps by altering the development of the T-regulatory cells.</p><p>As a Latina scientist investigating interactions between diet, microbiome and immunity, I must stress the importance of better policies to improve access to healthy foods, which lead to a healthier microbiome. It is also important to design culturally sensitive dietary interventions for Black and Latinx communities. While a good-quality diet might not prevent SARS-CoV-2 infection, it can treat the underlying conditions related to its severity.</p><p><em><a href="https://theconversation.com/profiles/ana-maldonado-contreras-1152969" target="_blank">Ana Maldonado-Contreras</a> is an assistant professor of Microbiology and Physiological Systems at the University of Massachusetts Medical School.</em></p><p><em>Disclosure statement: Ana Maldonado-Contreras receives funding from The Helmsley Charitable Trust and her work has been supported by the American Gastroenterological Association. She received The Charles A. King Trust Postdoctoral Research Fellowship. She is also member of the Diversity Committee of the American Gastroenterological Association.</em></p><p><em style="">Reposted with permission from <a href="https://theconversation.com/a-healthy-microbiome-builds-a-strong-immune-system-that-could-help-defeat-covid-19-145668" target="_blank" rel="noopener noreferrer" style="">The Conversation</a>. </em></p>From Your Site Articles
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