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Medjool dates are a variety of dates enjoyed for their natural sweetness. They're larger, darker, and more caramel-like in taste than other common types like Deglet Noor.
As tropical stone fruits, they have a single pit surrounded by edible flesh.
Native to Morocco, Medjool dates come from the date palm tree (Phoenix dactylifera) and are now grown in warm regions of the United States, the Middle East, South Asia, and Africa.
They're often sold dried but not dehydrated, making them soft and sticky. Their sugars become more concentrated as they dry, which further increases their sweetness.
This article tells you all you need to know about the nutritional content, benefits, and uses of Medjool dates.
Medjool Date Nutrition Facts
Medjool dates are a concentrated source of healthy nutrients. Just 2 dates (48 grams) provide (1):
- Calories: 133
- Carbs: 36 grams
- Fiber: 3.2 grams
- Protein: 0.8 grams
- Sugar: 32 grams
- Fat: 0 grams
- Calcium: 2% of the Daily Value (DV)
- Iron: 2% of the DV
- Potassium: 7% of the DV
- Copper: 19% of the DV
- Vitamin B6: 7% of the DV
- Magnesium: 6% of the DV
Dates offer a significant amount of fiber and variety of vitamins and minerals, including iron, potassium, B vitamins, copper, and magnesium.
Compared with other common varieties like Deglet Noor, Medjool dates contain significantly more calcium.
Calorie and Sugar Content
Dates are a concentrated source of natural sugars.
While people who monitor their blood sugar may need to moderate their intake of dates, one small study found that this stone fruit has a low glycemic index (GI) and shouldn't cause large increases in blood sugar.
Yet, Medjool dates pack many calories in a small serving. For this reason, you may want to keep your intake in check.
Dried fruits, which also include raisins, dried apricots, and prunes, contain more calories per serving than their fresh counterparts because they have less water.
Most of the calories in Medjool dates come from their sugars.
Summary
Medjool dates are rich in natural sugars, fiber, and several vitamins and minerals. Like other dried fruits, they pack a lot of calories in a small serving.
Potential Health Benefits
Medjool dates offer several health benefits.
May Protect Your Heart
The fiber and antioxidants in Medjool dates may help protect your heart.
Fiber can help lower your LDL (bad) cholesterol and keep your arteries clean, reducing your risk of heart disease. Just 2 dates (48 grams) contains over 3 grams of fiber.
One test-tube study found that Medjool and other date varieties lowered LDL (bad) cholesterol and prevented the buildup of plaque in arteries. Plaque accumulation can eventually block blood flow, leading to a heart attack or stroke.
Medjool dates are also a rich source of antioxidants, which help fight damage caused by unstable molecules called free radicals. Their carotenoid and phenolic acid antioxidants have both been studied for their beneficial effects on heart health.
Supports Healthy Digestion
Fiber is essential to promoting healthy digestion and bowel regularity. In fact, sufficient fiber in your daily diet helps form stool and prevent constipation.
Eating enough fiber may also reduce your risk of digestive diseases like colorectal cancer.
In a 3-week study, 21 people ate 7 dates (168 grams) per day and significantly improved their bowel movement frequency, compared with when they didn't eat dates.
High in Antioxidants
Medjool dates boast several antioxidants, which can protect your cells from oxidative damage that can lead to diseases like cancer, heart disease, and brain ailments.
Those in Medjool dates include flavonoids, carotenoids, and phenolic acids, which have been studied for their anti-inflammatory, anticancer, and brain-protective properties.
One study in dried fruit found that dates had the highest antioxidant content when compared with figs and prunes.
Other Potential Health Benefits
- Natural fuel for your body. Medjool dates offer a high number of carbs in a small serving. Carbs are your body's main source of energy.
- May support bone health. Medjool dates contain a small amount of calcium and are a decent source of potassium, manganese, and copper, all of which are important nutrients for bone health.
- May protect brain health. Animal studies link dates' antioxidants to lower levels of inflammatory markers and reduced brain plaques associated with conditions like Alzheimer's disease.
Bear in mind that more research is needed on these benefits.
Summary
Medjool dates contain antioxidants and nutrients that may lower your risk of heart disease, promote digestion, and support heart health, among other benefits.
How to Add Medjool Dates to Your Diet
Medjool dates can be found year-round at most grocery stores. They're often sold with other dried or raw foods.
Some Medjool dates are pitted, but if you purchase ones with pits, you'll need to remove them before eating. Simply slice the date open lengthwise and pull out the pit.
These dried fruits make a great sugar alternative due to their sweetness, which comes from fructose, a natural sugar.
To substitute Medjool dates for sugar, make a date paste by blending 2 cups (480 grams) of pitted dates with 1 1/4 cups (300 ml) of water, then use this paste instead of sugar in your recipes at a 1:1 ratio.
You can also add this sweet fruit to smoothies, sauces, and dressings, or chop them in a food processor and use them for no-bake desserts like pie crusts, energy balls, and fruit-and-chocolate bars.
What's more, you can fill raw Medjool dates with peanut butter, cheese, nuts, or even cooked grains like rice.
Store your dates in a cool, dry place like a pantry or your refrigerator. Keep them in a sealed container to help retain their moisture.
Summary
Medjool dates are versatile and easy to add to your diet. You can eat them raw, in smoothies, stuffed, or as a natural sweetener in desserts.
The Bottom Line
Medjool dates are high in calories but full of nutrients and antioxidants that are linked to many health benefits.
In particular, their fiber may boost digestion and heart health while lowering your risk of several chronic diseases.
You can eat them as a snack, in smoothies, or as a natural sweetener in various dishes and desserts.
Reposted with permission from Healthline. For detailed source information, please view the original article on Healthline.
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Seabirds often follow fishing vessels to find easy meals. Alexander Petrov / TASS via Getty Images
By Jim Palardy
As 2021 dawns, people, ecosystems, and wildlife worldwide are facing a panoply of environmental issues. In an effort to help experts and policymakers determine where they might focus research, a panel of 25 scientists and practitioners — including me — from around the globe held discussions in the fall to identify emerging issues that deserve increased attention.
<p>The panel, coordinated by the UK-based Cambridge Conservation Initiative, conducted a horizon scan — an effort to spot early signs of significant phenomena — of global biological <a href="https://www.ecowatch.com/tag/conservation">conservation</a> issues. For <a href="https://www.cell.com/trends/ecology-evolution/fulltext/S0169-5347(20)30306-2?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0169534720303062%3Fshowall%3Dtrue" target="_blank" rel="noopener noreferrer">the resulting study</a>, which was funded by the UK's Natural Environment Research Council and the Royal Society for the Protection of Birds, the panel winnowed down an initial list of 97 topics, settling on the following 15 because of their novelty or their potential to move the conservation needle in either a positive or negative direction over the coming decade.</p>
<h2>1. Seabirds Could Help Spot Illegal Fishing</h2><p>Seabirds often follow fishing vessels to score easy meals. Now, scientists are hoping to exploit this behavior to help spot illegal, unregulated, and unreported fishing, which accounts for up to $23.5 billion worth of seafood every year, or 1 in 5 fish sold. Researchers have had some success attaching transmitters to seabirds to locate fishing vessels in the Indian Ocean, but more study is needed to validate the use of this tactic.</p>
<h2>2. Marine Vessels and GPS Spoofing</h2><p>Vessels plying the ocean navigate and transmit their locations and identities mainly through the global navigation satellite system (GNSS) and automatic identification system (AIS). The panel points out that a recent rise in GNSS spoofing and AIS cloning incidents could facilitate the trade of illegal goods and hamper authorities' efforts to identify vessels engaged in illicit resource extraction activities such as fishing and dredging.</p>
<h2>3. More Corals May Suffer From Lack of Oxygen<br></h2><p>Several factors — including climate-driven marine heat waves and nutrient runoff from land — can lower oxygen levels in the ocean. Corals in the Atlantic, Indian, and Pacific oceans have died from this hypoxia, and, although those events weren't widespread, some scientists fear that the threat may grow significantly as climate change further warms the ocean. Research is needed to better understand the extent and impact of low oxygen conditions on coral reefs.</p>
<h2>4. Understanding the Impacts of Increased Dissolved Iron on Coastal Polar Ecosystems</h2><p>Coastal zones in polar latitudes are among Earth's most productive — that is, they create and support large numbers of organisms ranging from tiny marine plants to animals such as polar bears and seals — a characteristic driven by the availability of dissolved iron from glaciers and ice. Increased melting in the polar regions will result in higher iron concentrations, which in turn will probably fuel more intense phytoplankton blooms and enable organisms on the seafloor to capture more carbon and other nutrients. Such changes could have wide-ranging effects — including impacts on the structure of the region's marine ecosystems and on carbon sequestration — and warrants investigation.</p>
<h2>5. What to Do With a Growing Number of Decommissioned Offshore Energy Platforms</h2><p>It is estimated that 3,000 offshore oil and gas platforms will be decommissioned in the coming decades and that the number of offshore wind farms will continue to grow. Currently, decommissioning practices vary by country and include full removal, conversion of platforms to artificial reefs, and abandonment. As new offshore energy infrastructure is built and old platforms are phased out, nations will need to evaluate the immediate and long-term impacts of their decommissioning strategies on the marine environment.</p>
<h2>6. A Drug Problem in the Water<br></h2><p>When some chemicals used in pharmaceuticals and in garden and farm products are introduced into waterways — usually through runoff or via sewage systems directly or in human waste — they can cause changes in fish and other organisms, including altering the number of female to males in a population, lower fertility, and deformities. There is emerging evidence that the effects of exposure can be multigenerational, affecting organisms that were never directly exposed.</p>
<h2>7. Changes in Low Cloud Cover</h2><p>Low clouds shade sizable portions of the planet in subtropical regions. It is predicted that these clouds will become increasingly unstable if atmospheric carbon dioxide continues to rise at current rates. The resulting changes could have negative effects on wildlife and human communities.</p>
<h2>8. Tree Planting as a Simple Carbon Sequestration Solution</h2><p>Pledges to plant large areas of trees to help tackle climate change are often perceived as a win for conservation. However, tree planting must be planned and implemented with a clear understanding of regional ecosystems to avoid negative effects on biological diversity.</p>
<h2>9. Logging to Reduce Fire Risk</h2><p>As nations around the world contend with more extreme wildfires, some policymakers suggest that tree removal may be part of the solution. However, the effectiveness of such policies is uncertain, and any short-term gains from removing trees are often offset by the growth of non-native grasses and flowering plants, which may themselves be highly flammable.</p>
<h2>10. Large-Scale Adoption of Sustainable Farming Techniques Across India</h2><p>Driven by government policies and local innovations, sustainable farming practices are becoming more prevalent in India. The state government of Sikkim has adopted organic farming as policy, and the state of Andhra Pradesh, with 6 million farmers, plans to adopt natural farming practices by 2025. Other states across the country plan to follow suit. Early evaluations indicate that these large-scale transitions boost crop yields and incomes, improve the health of farmers, and increase women's access to microfinance. With such results, there is the potential for similar large-scale shifts in other parts of the world.</p>
<h2>11. Low Earth-Orbiting Satellites May Mislead Animals Responding to Celestial Cues</h2><p>More than 2,600 artificial satellites currently orbit the earth, a number that is rapidly increasing. Many species of mammals, insects, and birds use celestial cues to migrate long distances and to orient themselves in local habitats and could be affected by the proliferation of satellites.</p>
<h2>12. Bitcoin Mining With Stranded Energy</h2><p>An emerging use for stranded energy sources, such as low-value methane byproducts vented from oil wells and excess energy produced by wind turbines and solar panels, is to power computers used for Bitcoin mining — the process of creating new Bitcoin by solving complex algorithms. Monetizing stranded energy in this way is a mixed bag that decision-makers will probably have to evaluate. The practice could increase carbon emissions from marginal fossil fuel sources but also could incentivize the deployment of renewable energy by guaranteeing a minimum selling price.</p>
<h2>13. Open-Source Investigations of Environmental Threats</h2><p>Scientists demonstrated some success with using online videos, social media posts, and other open-source data to document the effects of the locust swarms in East Africa in 2020. As faster internet connections and access to smartphones continue to grow globally, the use of open-source data may become an effective tool for researchers.</p>
<h2>14. Self-Healing Building Materials</h2><p>The potential to engineer building materials made of chemicals, polymers, and bacteria that can fix themselves when damaged could reduce the need for repairs and shrink the environmental footprints of construction projects. Recently, scientists at the University of Colorado at Boulder used a type of cyanobacteria found in the ocean, along with other materials, to <a href="https://www.cell.com/matter/pdfExtended/S2590-2385(19)30391-1" target="_blank" rel="noopener noreferrer">engineer a living building material</a> that can regenerate when fractured.</p>
<h2>15. A Waterway to Connect the Baltic and Black Seas</h2><p>A planned 1,200-mile inland navigable waterway connecting the Baltic and Black seas would alter the flow of cargo and trade in the region. However, the waterway, which would pass through Poland, Belarus, and Ukraine, could alter habitat in 70 wildlife areas and numerous international conservation areas, introduce non-native species, and change the region's rivers and wetlands. Additionally, dredging in the Chernobyl Exclusion Zone could disrupt radioactive sediment.</p>
<p><em>Jim Palardy is a project director with The Pew Charitable Trusts' conservation science program. He served on this year's horizon scan panel and is a co-author on the resulting study.</em><br/></p><p><em>Reposted with permission from <a href="https://www.pewtrusts.org/en/research-and-analysis/articles/2021/01/13/top-15-conservation-issues-of-2021-include-big-threats-and-potential-bright-spots" target="_blank">The Pew Charitable Trust</a>.</em></p>
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Ask a Scientist: What Should the Biden Administration and Congress Do to Address the Climate Crisis?
19h
Climate
A damaged home and flooding are seen in Creole, Louisiana, following Hurricane Laura's landfall on August 27, 2020. Joe Raedle / Getty Images
By Elliott Negin
What a difference an election makes. Thanks to the Biden-Harris victory in November, the next administration is poised to make a 180-degree turn to again address the climate crisis.
<p>President Trump famously called climate change a "hoax," appointed <a href="https://www.nytimes.com/interactive/2020/01/14/climate/fossil-fuel-industry-environmental-policy.html" target="_blank">fossil fuel industry lobbyists</a> to key positions in his administration, rolled back the Obama-era rule that would have curbed power plant carbon emissions, and weakened Obama-era limits on vehicle carbon emissions. Just a day after last fall's election, he pulled the United States out of the international Paris climate agreement.</p><p>By contrast, President-elect Biden has endorsed a $2 trillion climate plan, and pledged to issue at least <a href="https://s2.washingtonpost.com/2da6eed/5fdb55659d2fda0efb8b5293/596c46649bbc0f208657f096/11/67/5fdb55659d2fda0efb8b5293" target="_blank">10 executive orders</a> to protect the climate and rejoin the <a href="https://twitter.com/JoeBiden/status/1340427943051284480" target="_blank" rel="noopener noreferrer">Paris climate accord</a> on Day One of his administration. He also has appointed an impressive and diverse climate change team to take key administration positions, including New Mexico Rep. Deb Haaland, who co-sponsored the Green New Deal, to run the Interior Department; North Carolina Department of Environmental Quality head Michael Regan to lead the Environmental Protection Agency; former Environmental Protection Agency chief Gina McCarthy as national climate advisor; and former Secretary of State John Kerry, who helped negotiate the Paris climate agreement, to serve as his international climate envoy.</p><p>That's a welcome relief, because the world is running out of time. In 2020 alone, wildfires burned millions of acres in Australia and California to a crisp; heat waves scorched Europe, Asia and the Arctic; floods inundated the U.S. Midwest as well as nations in Africa and Asia; and a record-breaking Atlantic hurricane season battered the coasts of Central America, Caribbean islands and the United States.</p><p>But for all the promises President-elect Biden has made, some nagging questions remain: Given the constraints of a closely divided Congress, how much will the Biden administration truly be able to accomplish? And even with the United States rejoining the Paris accord, will countries live up to its promise to keep the Earth's temperature in check?</p><p>For some answers, I turned to <a href="https://www.ucsusa.org/about/people/rachel-cleetus" target="_blank" rel="noopener noreferrer">Climate and Energy Program Policy Director Rachel Cleetus</a>, who I last <a href="https://blog.ucsusa.org/elliott-negin/what-do-you-see-as-the-most-important-elements-of-a-post-pandemic-economy" target="_blank" rel="noopener noreferrer">interviewed in May</a> about what a post-pandemic economy should look like. The questions I posed to her this time around are a logical extension of the conversation we had then.</p>
<p><strong>EN: Before we dig into what we can expect from the incoming Biden administration, let's talk about what Congress included in the pandemic relief package it passed just before Christmas. I don't know about you, but I was pleasantly surprised to learn that it included some good climate-related provisions. Does this suggest that the next Congress will take climate change seriously?</strong></p><p>RC: The omnibus pandemic relief bill Congress just passed was long overdue and desperately needed, given the fact that millions of people are in increasingly dire economic straits. It also included a provision to dramatically reduce the use of hydrofluorocarbons (HFCs), extremely potent heat-trapping gases used in air conditioners and refrigerators; an extension of renewable electricity production and investment tax credits, which will help boost clean energy and create jobs; support for energy storage technology research and development; and increased funding for ARPA-E, the Department of Energy's technology innovation program. The bill also included a one-year extension of the Black Lung Disability Trust Fund, a welcome but inadequate provision as black lung disease hits record levels in coal country.</p><p>The <a href="https://blog.ucsusa.org/shana-udvardy/congress-continues-to-affirm-that-climate-security-is-national-security" target="_blank" rel="noopener noreferrer">National Defense Authorization Act</a>, which Congress just passed with an overwhelming bipartisan override of President Trump's veto, also includes provisions recognizing the impact of climate change on the military and the need to invest in resilience measures.</p><p>These provisions demonstrate that Congress can act in a bipartisan manner on clean energy and climate change issues. But much more will be needed in the months and years ahead to make steep cuts in global warming emissions and achieve comprehensive, bold and just climate policies that benefit everyone. Congress has yet to demonstrate the will to act commensurately with the scale of the challenges we face, which is why we will need to continue to pressure policymakers to do the right thing after the new Congress and administration take office.</p>
<p><strong>EN: Notwithstanding the fact that leading Republicans supported the climate-related elements of the pandemic relief package, how much will the incoming Biden administration have to rely on executive orders to advance initiatives to combat climate change? After all, the oil and gas industry still has a great deal of influence over Congress.</strong></p><p>RC: President Biden should send a clear and strong signal, early on, that he is committed to using his full powers to advance climate action through executive authorities and regulations. Here are some of the <a href="https://blog.ucsusa.org/rachel-cleetus/biden-climate-priorities" target="_blank" rel="noopener noreferrer">most important actions on climate</a> that he should take, many of which could be done within the first 100 days and some which should happen via a Day One executive order on climate change:</p><ul><li>Set science-informed climate goals and commit the United States to reaching net-zero carbon emissions economywide no later than 2050, and at least 50 percent below 2005 levels by 2030.</li><li>Direct all federal agencies to incorporate climate science into their actions and develop updated climate action plans.</li><li>Initiate administrative and regulatory actions to sharply curtail heat-trapping emissions economywide and advance climate resilience, prioritizing investments in historically marginalized communities.</li><li>Rejoin the Paris agreement, with an ambitious commitment to cut heat-trapping emissions and provide climate funding for developing countries, in line with the US fair share contribution to global climate goals.</li><li>Reverse the Trump administration's egregious executive orders that have halted, undermined, and reversed climate action.</li><li>Create White House-level offices focused on environmental justice and economic transition to elevate and mainstream these priorities.</li></ul><p>As you note, opposition from the fossil fuel companies is not going away any time soon. They may continue to try to slow down or stop climate action, or at best support incremental policy changes that preserve their profits—even as they <a href="https://ucsusa.org/about/news/exxonmobils-five-year-emissions-reduction-plan-too-lievettle-too-late" target="_blank" rel="noopener noreferrer">claim to endorse</a> the Paris agreement's net-zero goal.</p><p>UCS and its coalition partners will continue to engage in sharp and strategic corporate campaigns to expose their disingenuous actions, <a href="https://blog.ucsusa.org/kathy-mulvey/bankrolling-climate-disaster-stop-the-money-pipeline-to-fossil-fuel-companies" target="_blank" rel="noopener noreferrer">curtail their Wall Street financing</a>, and prod them to align their business models with what the science demonstrates is necessary. We will continue to push for companies to <a href="https://blog.ucsusa.org/nicole-pinko/climate-risk-disclosure-act-is-good-for-your-investments" target="_blank" rel="noopener noreferrer">disclose their climate risks</a>, and for <a href="https://www.ucsusa.org/about/news/trading-commission-report-sends-clear-signal-climate-change-risks-us-economy-0" target="_blank" rel="noopener noreferrer">financial regulators</a> to require this. And we support the rights of affected parties to seek legal accountability for climate damages caused by fossil fuel companies.</p>
<p><strong>EN: OK. So what can a narrowly divided Congress accomplish?</strong></p><p>RC: Congress also will have to step up to play its part. We are coming off a year of record-breaking climate related disasters—including wildfires, hurricanes, floods, and heatwaves—which intersected cruelly with the coronavirus pandemic and the resulting ongoing economic crisis. People across the country need Congress to do its job. Securing robust, comprehensive, durable climate and clean energy policy will require legislation.</p><p>President Biden should immediately begin working with the new Congress to advance a suite of policies that ramp up clean energy, drive down carbon emissions economywide, and build climate resilience, while also addressing longstanding environmental injustices that have disproportionately affected low-income communities and communities of color and ensuring a fair transition for coal communities. Breaking through the long-standing political logjam won't be easy, but the needs are urgent and the economic, health and climate benefits of a low-carbon climate-resilient economy are clear.</p><p>Many of these policy priorities were highlighted in the <a href="https://joebiden.com/joes-vision/" target="_blank" rel="noopener noreferrer">Biden-Harris campaign platform</a>. The incoming administration must do all it can to prod Congress to pass legislation addressing them. Here's just a partial list of what we need:</p><p><em><strong>Additional pandemic relief and economic recovery packages</strong></em>. More funding for public health priorities and economic relief is desperately needed at the national, state and local level. Congress should include a robust "green" economic recovery package to jumpstart and foster a just and equitable economic recovery, with job creation driven by investments in clean energy and climate resilient infrastructure. Forty percent of these investments should directly benefit historically marginalized communities.</p><p><em><strong>Fair transition for workers and communities</strong></em>. Congress should pass a comprehensive, well-funded transition package for displaced workers and communities hurt by the country's ongoing transition away from coal.</p><p><em><strong>Environmental justice</strong></em>. Congress should strengthen public health safeguards, tighten enforcement, and invest in cleaning up the cumulative toxic burden of pollution in fence-line and frontline communities, which are disproportionately low-income communities and communities of color.</p><p><em><strong>Recognition of climate change's financial and economic risks</strong></em>. Congress should pass legislation to ensure that financial regulators require corporations to disclose their climate risk to ensure they—and the market more broadly—are appropriately accounting for such risks and taking steps to mitigate it.</p><p><em><strong>Guaranteed community access to the courts</strong></em>. As a mounting number of cities, counties and states seek to hold fossil fuel companies accountable for climate damages and fraud, here's one thing Congress should not do: pass laws attempting to limit or eliminate communities' access to the courts to seek redress.</p>
<p><strong>EN: President-elect Biden recently <a href="https://twitter.com/JoeBiden/status/1340427943051284480" target="_blank" rel="noopener noreferrer">proclaimed</a> that he will "put America back in the business of leading the world on climate change." What should that mean in concrete terms? As the country responsible for the largest share of cumulative carbon emissions to date, what does the United States have to do regain international respect and provide leadership?</strong></p><p>RC: To be perfectly frank, the Biden administration will have to do a lot more than trot out tired rhetoric about US leadership on climate action.</p><p>What the country and the rest of the world need is for the United States to take its place at the table, alongside and in cooperation with nations large and small, and do its part responsibly, fairly and consistently. The Biden administration and Congress need to enact strong national climate policies and make an ambitious, credible emissions reduction commitment ahead of the next international climate talks. They also must commit to scaled-up climate finance for developing countries. Finally, they have to work together with states, cities, tribal governments, businesses, and local stakeholders, many of whom have contributed to significant climate progress despite the absence of national leadership in the last four years. It's time—well past time, actually—for meaningful federal action.</p>
<p><em>Reposted with permission from </em><em><a href="https://blog.ucsusa.org/elliott-negin/what-should-the-new-administration-and-congress-do-to-address-the-climate-crisis" target="_blank">Union of Concerned Scientists</a>.</em><a href="https://www.ecowatch.com/r/entryeditor/2650012800#/" target="_self"></a></p>From Your Site Articles
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A fast-spreading variant of the coronavirus that causes COVID-19 has been found in at least 10 states, and people are wondering: How do I protect myself now?
<p>We saw what the new variant, known as B.1.1.7, can do as it <a href="https://www.sciencemag.org/news/2020/12/mutant-coronavirus-united-kingdom-sets-alarms-its-importance-remains-unclear" target="_blank">spread quickly through southeastern England</a> in December, causing case numbers to spike and triggering stricter lockdown measures.</p><p>The new variant has been estimated to be <a href="https://cmmid.github.io/topics/covid19/uk-novel-variant.html" target="_blank">50% more easily transmitted than common variants</a>, though it <a href="https://www.cdc.gov/mmwr/volumes/70/wr/mm7003e2.htm?s_cid=mm7003e2_e" target="_blank" rel="noopener noreferrer">appears to affect people's health in the same way</a>. The increased transmissibility is believed to arise from a <a href="https://www.biorxiv.org/content/10.1101/2020.12.29.424708v1" target="_blank" rel="noopener noreferrer">change in the virus's spike protein</a> that can allow the virus to more easily enter cells. These and other <a href="https://doi.org/10.1101/2020.12.24.20248834" target="_blank" rel="noopener noreferrer">studies on the new variant</a> were released before peer review to share their findings quickly.</p><p>Additionally, there is some evidence that patients infected with the new B.1.1.7 variant may have a <a href="https://www.medrxiv.org/content/10.1101/2020.12.24.20248834v1.full" target="_blank" rel="noopener noreferrer">higher viral load</a>. That means they may expel more virus-containing particles when they breathe, talk or sneeze.</p><p>As professors who study <a href="https://www.clarkson.edu/people/byron-erath" target="_blank" rel="noopener noreferrer">fluid dynamics</a> <a href="https://www.clarkson.edu/people/suresh-dhaniyala" target="_blank" rel="noopener noreferrer">and aerosols</a>, we investigate how airborne particles carrying viruses spread. There is still a lot that scientists and doctors don't know about the coronavirus and its mutations, but there are some clear strategies people can use to protect themselves.</p>
Airborne Particles Are Still the Biggest Problem
<p>The <a href="https://theconversation.com/why-it-matters-that-the-coronavirus-is-changing-and-what-this-means-for-vaccine-effectiveness-152383" target="_blank" rel="noopener noreferrer">SARS-CoV-2 variants</a> are believed to spread primarily through the air rather than on surfaces.</p><p>When someone with the coronavirus in their respiratory tract coughs, talks, sings or even just breathes, infectious respiratory droplets can be expelled into the air. These droplets are tiny, predominantly in the range of <a href="https://www.sciencedirect.com/science/article/pii/S0021850211001200?casa_token=KtyrsEfbeqcAAAAA:vv10sSxm33tzg0EQvNMIFtV7GCu5gE9QAzuyzHKr2_4Cl0OFkUJoGwzn4d0ZnEWS19NsOTuH" target="_blank" rel="noopener noreferrer">1-100 micrometers</a>. For comparison, a human hair is about 70 micrometers in diameter.</p><p>The larger droplets fall to the ground quickly, rarely traveling farther than 6 feet from the source. The bigger problem for disease transmission is the tiniest droplets – those less than 10 micrometers in diameter – which can remain suspended in the air as aerosols for <a href="https://academic.oup.com/cid/article/50/5/693/325466" target="_blank">hours at a time</a>.</p><span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="bb67b83dcafe589f350daf3df60fa29d"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/UNCNM7AZPFg?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span>
<p>With people possibly having more virus in their bodies and the virus being more infectious, everyone should take extra care and precautions. Wearing face masks and social distancing are essential.</p><p>Spaces and activities that were previously deemed "safe," such as some indoor work environments, may present an elevated infection risk as the variant spreads.</p><p>The concentration of aerosol particles is usually highest right next to the individual emitting the particles and decreases with <a href="https://aip.scitation.org/doi/10.1063/5.0025476" target="_blank">distance from the source</a>. However, in indoor environments, aerosol concentration levels can quickly build up, similar to how <a href="https://theconversation.com/what-a-smoky-bar-can-teach-us-about-the-6-foot-rule-during-the-covid-19-pandemic-145517" target="_blank" rel="noopener noreferrer">cigarette smoke accumulates within enclosed spaces</a>. This is particularly problematic in spaces that have poor ventilation.</p><p>With the new variant, aerosol concentration levels that might not have previously posed a risk could now lead to infection.</p>
<img lazy-loadable="true" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTQ5Njc1My9vcmlnaW4ucG5nIiwiZXhwaXJlc19hdCI6MTY0MTg5MzExM30.2KlkIn9wVomwIkIEvkEpjx9alJ61pU4Onv54-nS-Ric/img.png?width=980" id="7052f" class="rm-shortcode" data-rm-shortcode-id="64f0b78347b7911d5eee1f15d7999b22" data-rm-shortcode-name="rebelmouse-image" data-width="1290" data-height="932" />
Daily case reports and 7-day rolling average as of Jan. 16, 2021.Chart: The Conversation, CC-BY-ND Source: COVID Tracking Project Get the data
What Can You Do to Stay Safe?
<p>1) Pay attention to the type of face mask you use, and how it fits.</p><p>Most off-the-shelf face coverings are not 100% effective at preventing droplet emission. With the new variant spreading more easily and likely infectious at lower concentrations, it's important to select coverings with materials that are most effective at stopping droplet spread.</p><p>When available, N95 and surgical masks consistently perform the best. Otherwise, face coverings that use <a href="https://www.sciencedirect.com/science/article/pii/S2352431620301802?casa_token=-Dj6nGBAm24AAAAA:qq9BpbzCKaPDFcV73ohA2fCnhE_Zlkss6Bei3kUwq9QYndhHj0Vafbbd-ef_855lx6knDfUt" target="_blank">multiple layers of material</a> are preferable. Ideally, the material should be a tight weave. High thread count cotton sheets are an example. Proper fit is also crucial, as gaps around the nose and mouth can <a href="https://pubs.acs.org/doi/10.1021/acsnano.0c03252" target="_blank" rel="noopener noreferrer">decrease the effectiveness by 50%</a>.</p><p>2) Follow social distancing guidelines.</p><p>While the current social distancing guidelines are not perfect – <a href="https://theconversation.com/what-a-smoky-bar-can-teach-us-about-the-6-foot-rule-during-the-covid-19-pandemic-145517" target="_blank" rel="noopener noreferrer">6 feet isn't always enough</a> – they do offer a useful starting point. Because aerosol concentrations levels and infectivity are highest in the space immediately surrounding anyone with the virus, increasing physical distancing can help reduce risk. Remember that people are infectious <a href="https://medical.mit.edu/faqs/COVID-19#faq-10" target="_blank" rel="noopener noreferrer">before they start showing symptoms</a>, and they many never show symptoms, so don't count on seeing signs of illness.</p><p>3) Think carefully about the environment when entering an enclosed area, both the ventilation and how people interact.</p><p>Limiting the size of gatherings helps reduce the potential for exposure. Controlling indoor environments in other ways can also be a highly effective strategy for reducing risk. This includes <a href="https://theconversation.com/what-a-smoky-bar-can-teach-us-about-the-6-foot-rule-during-the-covid-19-pandemic-145517" target="_blank" rel="noopener noreferrer">increasing ventilation rates</a> to bring in <a href="https://theconversation.com/keeping-indoor-air-clean-can-reduce-the-chance-of-spreading-coronavirus-149512" target="_blank" rel="noopener noreferrer">fresh air and filtering existing air</a> to dilute aerosol concentrations.</p><p>On a personal level, it is helpful to pay attention to the types of interactions that are taking place. For example, many individuals shouting can create a higher risk than one individual speaking. In all cases, it's important to minimize the amount of time spent indoors with others.</p><p>The CDC has warned that B.1.1.7 could <a href="https://www.cdc.gov/mmwr/volumes/70/wr/mm7003e2.htm?s_cid=mm7003e2_w" target="_blank" rel="noopener noreferrer">become the dominant SARS-CoV-2 variant</a> in the U.S. by March. Other fast-spreading variants have also been found in <a href="https://virological.org/t/genomic-characterisation-of-an-emergent-sars-cov-2-lineage-in-manaus-preliminary-findings/586" target="_blank" rel="noopener noreferrer">Brazil</a> and <a href="https://www.who.int/csr/don/31-december-2020-sars-cov2-variants/en/" target="_blank" rel="noopener noreferrer">South Africa</a>. Increased vigilance and complying with health guidelines should continue to be of highest priority.</p>From Your Site Articles
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A seagull flies in front of the Rampion offshore wind farm in the United Kingdom. Neil / CC BY 2.0
By Tara Lohan
A key part of the United States' clean energy transition has started to take shape, but you may need to squint to see it. About 2,000 wind turbines could be built far offshore, in federal waters off the Atlantic Coast, in the next 10 years. And more are expected.
<p>East Coast states from Maine to North Carolina are working to procure nearly <a href="https://www.oedigital.com/news/483741-2020-has-been-a-big-year-for-us-offshore-wind" target="_blank">30 gigawatts of offshore wind by 2035</a> — a huge leap from the five turbines currently generating 30 megawatts in Rhode Island waters. If a regulatory backlog of projects awaiting approval from the Interior Department's Bureau of Ocean Energy Management is finally unstuck — <a href="https://therevelator.org/offshore-wind-growth/" rel="noopener noreferrer" target="_blank">as experts hope will happen this year</a> — the buildout of offshore wind will arrive during a crucial decade for reducing greenhouse gas emissions.</p><p>Spinning turbine blades on the watery horizon may be a welcome sight in the fight against climate change, but they still come with potential threats to marine wildlife. Many environmental groups believe the challenges aren't insurmountable if scientific study can help inform regulatory action and if we can learn — and adapt our practices — as we go.</p><p>"We believe that offshore wind can absolutely be developed in an environmentally responsible manner," says Francine Kershaw, a staff scientist at the Natural Resources Defense Council. "But that has to be incorporated throughout the whole process — from site assessment through development, construction and operations."</p>
Threats to Birds
<p>One of the gravest threats facing birds is climate change, according to Audubon, which found that rising temperatures threaten <a href="https://www.audubon.org/2019climateissue" target="_blank" rel="noopener noreferrer">nearly two-thirds of North America's bird species</a>. That's why the impending development of offshore wind is a good thing, says Shilo Felton, a field manager in the organization's Clean Energy Initiative, but it also comes with dangers to birds that need to be better studied and mitigated.</p><p>The most obvious risk comes from birds colliding with spinning turbine blades. But offshore wind developments can also displace birds from foraging or roost sites, as well as migratory pathways.</p><p>Along the Atlantic Coast four imperiled species are of top concern to conservationists: the endangered piping plover, red knot, roseate tern and black-capped petrel, which is being considered for listing under the Endangered Species Act.</p><p>"Those four species are of utmost importance to make sure that we understand the impacts," says Felton. "But beyond that there are many species that are protected under the Migratory Bird Treaty Act and the Fish and Wildlife Conservation Act that could potentially see more impacts from offshore wind."</p><p>Northern gannets, for example, are at risk not just for collision but <a href="https://www.researchgate.net/publication/308703197_Possible_impacts_of_offshore_wind_farms_on_seabirds_a_pilot_study_in_Northern_Gannets_in_the_southern_North_Sea" target="_blank">habitat displacement</a>.</p><img lazy-loadable="true" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTQ3NDc0My9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTY2MzA3NTkwM30.L3sUMX9PbRxFqSnNPKWfQSB33NNak0zZ6x9gdLCZPJM/img.jpg?width=980" id="31fc5" class="rm-shortcode" data-rm-shortcode-id="e1429caf713cfa9e6b78cc218d884453" data-rm-shortcode-name="rebelmouse-image" data-width="799" data-height="533" />
A northern gannet flying along Cape May, N.J. Ann Marie Morrison / CC BY-NC-ND 2.0
<p>"There's <a href="https://www.sciencedirect.com/science/article/abs/pii/S0006320716303196" target="_blank">some evidence</a> that they just won't use areas where turbines are, but that also excludes them from key foraging areas," says Felton. Researchers are still studying what this may mean for the birds. But a <a href="https://www.sciencedirect.com/science/article/pii/S0141113620305304" target="_blank">study</a> published in December 2020 conducted at Bass Rock, Scotland — home to the world's largest northern gannet colony — found that wind developments could reduce their growth rate, though not enough to cause a population decline.</p><p>Other birds, such as great cormorants and European shags, are <a href="https://www.sciencedirect.com/science/article/abs/pii/S0006320716303196" target="_blank">attracted to wind developments</a> and use the infrastructure to rest while opening up new foraging areas farther from shore.</p><p>"There's plenty of potential for a bird to use a wind farm and still to avoid the turbines themselves," says Felton.</p><p>Birds like pelicans, however, are less versatile in their movements and are at particular risk of collision because of their flight pattern, she says.</p><p>But how disruptive or dangerous offshore turbines will be along the East Coast isn't yet known.</p><p>Federal and state agencies, along with nongovernmental organizations, says Felton, have done good research to try to better understand those potential impacts. "But these are all theoretical, because we don't have a lot of offshore wind yet in the United States."</p>Threats to Ocean Life
<p>Birds aren't the only wildlife of concern. More development in ocean waters could affect a litany of marine species, some of which are already facing other pressures from overfishing, pollution, habitat destruction and climate change.</p><p>Scientists have found that marine mammals like whales and dolphins could be disturbed by the jarring sounds of construction, especially if pile driving is used to hammer the steel turbine platform into the seafloor.</p><p>The noises, though short-lived, could impede communication between animals, divert them from migration routes or cause them to seek less suitable areas for feeding or breeding. Research from Europe found that harbor porpoises, seals and dolphins may avoid development areas during construction. In most, but <a href="https://iopscience.iop.org/article/10.1088/1748-9326/7/4/045101" target="_blank">not all cases</a>, the animals were believed to have returned to the area following construction.</p><p>The biggest concern for conservation groups in the United States is the critically endangered North American right whale. There are fewer than 400 remaining, and the species' habitat overlaps with a number of planned wind development areas along the East Coast.</p><p>"Offshore wind is in no way the cause of the challenges the whales face, but it's going to be another pressure point," says John Rogers, senior energy analyst for the Union of Concerned Scientists.</p><p>Researchers aren't sure how right whales will respond to the noise from pile driving.</p><p>"But we are concerned, based on what we know about how whales react to other noise sources, that they may avoid [wind development] areas," says Kershaw.</p><p>And if that displacement causes them to miss out on important food resources, it could be dangerous for a species already on the brink.</p><p>There are a few other potential threats, too.</p><p>Ships associated with the development — more plentiful during construction — also pose a danger. In the past few years cargo ships, fishing boats and other vessels have caused half of all deaths of North Atlantic right whales.</p><img lazy-loadable="true" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTQ3NDg5MC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTY1ODIyNzI3MX0.PzGzo5LJmV9E00augQhHgO5eMTxkVqRBYGZrzkrxP78/img.jpg?width=980" id="f44b2" class="rm-shortcode" data-rm-shortcode-id="5fcb375b72d14dd0cf745ecc7fb4494a" data-rm-shortcode-name="rebelmouse-image" data-width="799" data-height="533" />
A juvenile right whale breaches against the backdrop of a ship near the St. Johns River entrance. Florida Fish and Wildlife Conservation Commission / NOAA Research Permit #775-1600-10
<p>And after construction, the noise from the spinning turbines will be present in the water at low decibels. "We don't quite know how the great whales will react to those sounds," says Jeremy Firestone, the director of the Center for Research in Wind at the University of Delaware.</p><p>Other marine mammals may also perceive the noise, but at low decibels it's unlikely to be an impediment, <a href="http://www.int-res.com/abstracts/meps/v309/p279-295/" target="_blank">research has found</a>.</p><p>And it's possible that wind development could help some ocean life. Turbine foundations can attract fish and invertebrates for whom hard substrates create habitat complexity — known as the "reef effect," according to researchers from the University of Rhode Island's <a href="https://dosits.org/animals/effects-of-sound/anthropogenic-sources/wind-turbine/" target="_blank" rel="noopener noreferrer">Discovery of Sound in the Sea</a> program. Exclusion of commercial fishing nearby may also help shelter fish and protect marine mammals from entanglements in fishing gear.</p>Ensuring Safe Development
<p>Despite the potential dangers, researchers have gathered a few best practices to help diminish and possibly eliminate some risks.</p><p>When it comes to ship strikes, the easiest thing is to slow boats down, mandating a speed of <a href="https://biologicaldiversity.org/w/news/press-releases/vessel-speed-limits-sought-protect-endangered-north-atlantic-right-whales-2020-08-06/" target="_blank">10 knots</a> in wind development areas, and using visual and acoustic monitoring for whales.</p><p>Adjusting operations to reduce boat trips between the shore and the wind development will also help. A new series of service operating vessels can allow maintenance staff to spent multiple days onsite, says Kershaw, cutting down on boat traffic.</p><p>For construction noise concerns, developers can avoid pile driving during times of the year when whales are present. And, depending on the marine environment, developers could use "quiet foundations" that don't require pile driving. These include gravity-based or suction caisson platforms.</p><p>Floating turbines are also used in deep water, where they're effectively anchored in place — although that poses its own potential danger. "We have concerns that marine debris could potentially become entangled around the mooring cables of the floating arrays and pose a secondarily entanglement risk to some species," says Felton, who thinks more research should be conducted before those become operational in U.S. waters — a process that's already underway in Maine, where a <a href="https://composites.umaine.edu/2020/08/05/diamond-offshore-wind-rwe-renewables-join-the-university-of-maine-to-lead-development-of-maine-floating-offshore-wind-demonstration-project/" target="_blank" rel="noopener noreferrer">demonstration project is being built</a>.</p><p>If loud noises are unavoidable during construction, noise-reducing technologies such as bubble curtains can help dampen the sound. And scheduling adjacent projects to conduct similar work at the same time could limit the duration of disturbances.</p><img lazy-loadable="true" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTQ3NDkwMC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTY3NDIwMTMwNX0.EzMWtZyoKz02dkfoC7ZYvs51VS4JwnUZzeaby4WBs5w/img.jpg?width=980" id="fa370" class="rm-shortcode" data-rm-shortcode-id="5f32770cc89291d00aed7de6d0204760" data-rm-shortcode-name="rebelmouse-image" data-width="755" data-height="552" />
The foundation installation of the off shore wind farm Sandbank using a bubble curtain. Vattenfall / Ulrich Wirrwa / CC BY-NC-ND 2.0
<p>Once turbines become operational, reducing the amount of light on wind platforms or using flashing lights could help deter some seabirds, NRDC <a href="https://www.nrdc.org/sites/default/files/harnessing-wind-advance-wind-power-offshore-ib.pdf" target="_blank" rel="noopener noreferrer">researchers reported</a>. And scientists are exploring using ultrasonic noises and ultraviolet lighting to keep bats away. "Feathering," or shutting down the turbine blades during key migration times, could also help prevent fatalities.</p><p>"We need to make sure that offshore wind is the best steward it can be of the marine ecosystem, because we want and expect it to be a significant part of the clean energy picture in some parts of the country," says Rogers. "We also have to recognize that we're going to learn by doing, and that some of these things we're going to figure out best once we have more turbines in the water."</p><p>That's why environmental groups say it's important to establish baseline information on species before projects begin, and then require developers to conduct monitoring during construction and for years after projects are operational.</p><p>Employing an "adaptive management framework" will ensure that developers can adjust their management practices as they go when new information becomes available, and that those best practices are incorporated into the requirements for future projects.</p>Putting Research Into Action
<p>Advancing these conversations at the federal level during the Trump administration, though, has been slow going.</p><p>"We didn't really have any productive discussions with the administration in the last four years," says Kershaw.</p><p>And when it comes to birds, Felton says the Bureau of Ocean Energy Management's recently completed "draft cumulative environmental impact statement" covering offshore wind developments had a lot of good environmental research, but little focus on birds.</p><p>"Part of that comes from the current administration's interpretation of the Migratory Bird Treaty Act," she says.</p><p>President Trump has been hostile to both wind energy <em>and</em> birds, <a href="https://www.nytimes.com/2021/01/05/climate/trump-migratory-bird-protections.html" target="_blank">and finished gutting the Migratory Bird Treaty Act</a> in his administration's the final days, removing penalties for companies whose operations kill migratory birds.</p><p>There's hope that the Biden administration will take a different approach. But where the federal government has been lacking lately, Kershaw says, they've seen states step up.</p><p>New York, for example, has established an <a href="https://www.nyetwg.com/" target="_blank" rel="noopener noreferrer">Environmental Technical Working Group</a> composed of stakeholders to advise on environmentally responsible development of offshore wind.</p><p>The group is led by the New York State Energy Research and Development Authority, but it isn't limited to the Empire State. It's regional in focus and includes representatives from wind developers with leases between Massachusetts and North Carolina; state agencies from Massachusetts to Virginia; federal agencies; and science-based environmental NGOs.</p><p>New York's latest solicitation for clean energy projects includes up to 2,500 megawatts of offshore wind and <a href="https://www.nyetwg.com/announcements" target="_blank" rel="noopener noreferrer">requires developers</a> to contribute at least $10,000 per megawatt for regional monitoring of fisheries and other wildlife.</p><p>Environmental groups have also worked directly with developers, including an agreement with Vineyard Wind — an 800-megawatt project off the Massachusetts coast that could be the first utility-scale wind development in federal waters — to help protect North Atlantic right whales.</p><p>The agreement includes no pile driving from Jan. 1 to April 30, ceasing activities at other times when whales are visually or acoustically identified in the area, speed restrictions on vessels, and the use of noise reduction technology, such as a bubble curtain during pile driving.</p><p>"The developers signed the agreement with us, and then they incorporated, most, if not all of those measures into the federal permitting documents," says Kershaw. "The developers really did a lot of bottom up work to make sure that they were being very protective of right whales."</p><p>Environmental groups are in talks with other developers on agreements too, but Felton wants to see best practices being mandated at the federal level.</p><p>"It's the sort of a role that should be being played by the federal government, and without that it makes the permitting and regulation process less stable and less transparent," she says." And that in turn slows down the build out of projects, which is also bad for birds because it doesn't help us address and mitigate for climate change."</p><p>Kershaw agrees there's a lot more work to be done, especially at the federal level, but thinks we're moving in the right direction.</p><p>"I think the work that's been done so far in the United States has really laid the groundwork for advancing this in the right way and in a way that's protective of species and the environment," she says. "At the same time, it's important that offshore wind does advance quickly. We really need it to help us combat the worst effects of climate change."</p><p><em><a href="https://therevelator.org/author/taralohan/" target="_blank" rel="noopener noreferrer">Tara Lohan</a> is deputy editor of The Revelator and has worked for more than a decade as a digital editor and environmental journalist focused on the intersections of energy, water and climate. Her work has been published by The Nation, American Prospect, High Country News, Grist, Pacific Standard and others. She is the editor of two books on the global water crisis.</em></p><p><em style="">Reposted with permission from <a href="https://therevelator.org/offshore-wind-wildlife" target="_blank" style="">The Revelator</a>. </em></p>From Your Site Articles
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Cities Can Help Migrating Birds on Their Way By Planting More Trees and Turning Lights Off at Night
16 January
Animals
By Frank La Sorte and Kyle Horton
Millions of birds travel between their breeding and wintering grounds during spring and autumn migration, creating one of the greatest spectacles of the natural world. These journeys often span incredible distances. For example, the Blackpoll warbler, which weighs less than half an ounce, may travel up to 1,500 miles between its nesting grounds in Canada and its wintering grounds in the Caribbean and South America.
<img lazy-loadable="true" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTQ1OTYwNy9vcmlnaW4ucG5nIiwiZXhwaXJlc19hdCI6MTYzMzM0MTg3OH0.nNQfbJ7kSW-dhYN2fzUsXifK_9BZ0m-DgJ_O48NaMzk/img.png?width=980" id="17556" class="rm-shortcode" data-rm-shortcode-id="62e2bb2642ac5ed6921afa9f11210d6c" data-rm-shortcode-name="rebelmouse-image" data-width="1000" data-height="697" />
Blackpoll warbler abundance in breeding, non-breeding and migration seasons. Cornell Lab of Ornithology / CC BY-ND
<p>For many species, these journeys take place at night, when skies typically are calmer and predators are less active. Scientists do not have a good understanding yet of how birds navigate effectively at night over long distances.</p><p><span></span>We study bird migration and how it is being affected by factors ranging from <a href="https://scholar.google.com/citations?user=S04C3UMAAAAJ&hl=en" target="_blank">climate change</a> to <a href="https://scholar.google.com/citations?user=pPk38-8AAAAJ&hl=en" target="_blank">artificial light at night</a>. In a recent study, we used millions of bird observations by citizen scientists to document the <a href="https://doi.org/10.1016/j.envpol.2020.116085" target="_blank">occurrence of migratory bird species in 333 U.S. cities</a> during the winter, spring, summer and autumn.</p><img lazy-loadable="true" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTQ1OTYxMy9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYyMzk5NjQ2OX0.wgZKuxg3PNrZY0fvQEfZwX6kKXWapi0OEegDeQOL0ZI/img.jpg?width=980" id="d5433" class="rm-shortcode" data-rm-shortcode-id="0c08ac2b38d68da1788b356a5841f0f9" data-rm-shortcode-name="rebelmouse-image" data-width="1000" data-height="604" />
Blackpoll warbler. PJTurgeon / Wikipedia
<p>We used this information to determine how the number of migratory bird species varies based on each city's level of <a href="https://www.britannica.com/science/light-pollution" target="_blank" rel="noopener noreferrer">light pollution</a> – brightening of the night sky caused by artificial light sources, such as buildings and streetlights. We also explored how species numbers vary based on the quantity of tree canopy cover and impervious surface, such as concrete and asphalt, within each city. Our findings show that cities can help migrating birds by planting more trees and reducing light pollution, especially during spring and autumn migration.</p>Declining Bird Populations
<p>Urban areas contain numerous dangers for migratory birds. The biggest threat is the risk of <a href="https://doi.org/10.1650/CONDOR-13-090.1" target="_blank">colliding with buildings or communication towers</a>. Many migratory bird populations have <a href="http://dx.doi.org/10.1126/science.aaw1313" target="_blank">declined over the past 50 years</a>, and it is possible that light pollution from cities is contributing to these losses.</p><p>Scientists widely agree that light pollution can <a href="https://doi.org/10.1073/pnas.1708574114" target="_blank">severely disorient migratory birds</a> and make it hard for them to navigate. Studies have shown that birds will cluster around brightly lit structures, much like insects flying around a porch light at night. Cities are the <a href="https://doi.org/10.1002/fee.2029" target="_blank" rel="noopener noreferrer">primary source of light pollution for migratory birds</a>, and these species tend to be more abundant within cities <a href="https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.13792" target="_blank" rel="noopener noreferrer">during migration</a>, especially in <a href="https://doi.org/10.1016/j.landurbplan.2020.103892" target="_blank" rel="noopener noreferrer">city parks</a>.</p><img lazy-loadable="true" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTQ1OTYyNC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTY0Nzk5NTUwOH0.h8aA9ZJUJvLbHP82CVZAOkYcY54eljqMy4rrMaunO9M/img.jpg?width=980" id="608a8" class="rm-shortcode" data-rm-shortcode-id="3da85b14a1c03abfd4f95c00439fb36e" data-rm-shortcode-name="rebelmouse-image" data-width="1000" data-height="640" />
Composite image of the continental U.S. at night from satellite photos. NASA Earth Observatory images by Joshua Stevens, using Suomi NPP VIIRS data from Miguel Román, NASA's Goddard Space Flight Center
The Power of Citizen Science
<p>It's not easy to observe and document bird migration, especially for species that migrate at night. The main challenge is that many of these species are very small, which limits scientists' ability to use electronic tracking devices.</p><p>With the growth of the internet and other information technologies, new data resources are becoming available that are making it possible to overcome some of these challenges. <a href="https://doi.org/10.1038/d41586-018-07106-5" target="_blank">Citizen science initiatives</a> in which volunteers use online portals to enter their observations of the natural world have become an important resource for researchers.</p><p>One such initiative, <a href="https://ebird.org/home" target="_blank" rel="noopener noreferrer">eBird</a>, allows bird-watchers around the globe to share their observations from any location and time. This has produced one of the <a href="https://doi.org/10.1111/ecog.04632" target="_blank" rel="noopener noreferrer">largest ecological citizen-science databases in the world</a>. To date, eBird contains over 922 million bird observations compiled by over 617,000 participants.</p><span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="59e33da8efe0bf60f7bda00b06e1f4e2"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/StF19Qdgqn0?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span><p><em>Large clusters of birds (blue and green splotches) captured by weather radar during spring migration, April-May 2019.</em></p>
Light Pollution Both Attracts and Repels Migratory Birds
<p>Migratory bird species have evolved to use certain migration routes and types of habitat, such as forests, grasslands or marshes. While humans may enjoy seeing migratory birds appear in urban areas, it's generally not good for bird populations. In addition to the many hazards that exist in urban areas, cities typically lack the food resources and cover that birds need during migration or when raising their young. As scientists, we're concerned when we see evidence that migratory birds are being drawn away from their traditional migration routes and natural habitats.</p><p>Through our analysis of eBird data, we found that cities contained the greatest numbers of migratory bird species during spring and autumn migration. Higher levels of light pollution were associated with more species during migration – evidence that light pollution attracts migratory birds to cities across the U.S. This is cause for concern, as it shows that the influence of light pollution on migratory behavior is strong enough to increase the number of species that would normally be found in urban areas.</p><p>In contrast, we found that higher levels of light pollution were associated with fewer migratory bird species during the summer and winter. This is likely due to the scarcity of suitable habitat in cities, such as large forest patches, in combination with the adverse affects of light pollution on bird behavior and health. In addition, during these seasons, migratory birds are active only during the day and their populations are largely stationary, creating few opportunities for light pollution to attract them to urban areas.</p><span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="19d2d2bc77cd31e4374fd12cdadbe4bf"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/08ET47-b13o?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span><p><em><strong></strong>Darkening skies at night during migration season makes it easier for birds to navigate.</em></p>
Trees and Pavement
<p>We found that tree canopy cover was associated with more migratory bird species during spring migration and the summer. Trees provide important habitat for migratory birds during migration and the breeding season, so the presence of trees can have a strong effect on the number of migratory bird species that occur in cities.</p><p>Finally, we found that higher levels of impervious surface were associated with more migratory bird species during the winter. This result is somewhat surprising. It could be a product of the <a href="https://www.epa.gov/heatislands" target="_blank">urban heat island effect</a> – the fact that structures and paved surfaces in cities absorb and reemit more of the sun's heat than natural surfaces. Replacing vegetation with buildings, roads and parking lots can therefore make cities significantly warmer than surrounding lands. This effect could reduce cold stress on birds and increase food resources, such as insect populations, during the winter.</p><p>Our research adds to our understanding of how conditions in cities can both help and hurt migratory bird populations. We hope that our findings will inform urban planning initiatives and strategies to reduce the harmful effects of cities on migratory birds through such measures as <a href="https://www.arborday.org/programs/treecityusa/index.cfm" target="_blank" rel="noopener noreferrer">planting more trees</a> and initiating <a href="https://aeroecolab.com/uslights" target="_blank" rel="noopener noreferrer">lights-out programs</a>. Efforts to make it easier for migratory birds to complete their incredible journeys will help maintain their populations into the future.</p><p><em><span style="background-color: initial;"><a href="https://theconversation.com/profiles/frank-la-sorte-1191494" target="_blank">Frank La Sorte</a> is a r</span>esearch associate at the </em><em>Cornell Lab of Ornithology, Cornell University. <a href="https://theconversation.com/profiles/kyle-horton-1191498" target="_blank">Kyle Horton</a> is an assistant professor of Fish, Wildlife, and Conservation Biology at the Colorado State University.</em></p><p><em></em><em>Disclosure statement: Frank La Sorte receives funding from The Wolf Creek Charitable Foundation and the National Science Foundation (DBI-1939187). K</em><em>yle Horton does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.</em></p><p><em>Reposted with permission from <a href="https://theconversation.com/cities-can-help-migrating-birds-on-their-way-by-planting-more-trees-and-turning-lights-off-at-night-152573" target="_blank">The Conversation</a>. </em></p>
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