Aviation Accounts for 3.5% of Global Warming Caused by Humans, New Research Says

A new international study that used unprecedented calculations to pinpoint how much global air travel contributes to the heating of the atmosphere found that aviation makes up 3.5 percent of all the activities that contribute to the climate crisis, according to the University of Reading in the UK where some of the research was conducted.
It turns out that in the last 20 years, air travel has doubled its contribution as a driver of the climate crisis.
"It is growing so rapidly," said David Lee at Manchester Metropolitan University in the UK, as The New Scientist reported. "It's just astonishing."
The study looked at the time frame from 2000 to 2018, so it did not account for the current slowdown in air travel due to the coronavirus pandemic. And yet, Lee said that the current slowdown will be just a blip compared to the long-term damage that has already been done by air travel.
"It's not going to make much difference in the long term," Lee said, according to The New Scientist.
The paper, published in Atmospheric Environment, was a collaboration of international scientists. The researchers took the most comprehensive look to date at the various components of air travel, from the use of carbon dioxide and nitrogen oxide, to the effect that the white contrails behind a jet engine have on absorbing sunlight.
It turns out that those contrails along with a mix of water vapor, nitrogen oxide, aerosol gases and soot make up two-thirds of the environmental impact, according to the National Oceanic and Atmospheric Administration. The remaining one-third is attributed to the cumulative effect of greenhouse gases like carbon dioxide.
"The biggest problem underlying aviation is basically the public's desire to fly," said Lee, as CGTN in Beijing, China reported. "The problem with aviation is that it's highly dependent on liquid fossil fuel, kerosene, to power aircraft. So if we continue to depend on fossil fuel for powering an aircraft, it will become a much larger percentage of total emissions over time."
The five-year study is the first of its kind to use a complete set of calculations that employs a new metric introduced by the Intergovernmental Panel on Climate Change in 2013.
The new metric is called "effective radiative forcing," or ERF, according to the University of Reading. It is a complicated measurement of the energy coming from the sun that compares it with the energy emitted from Earth. It also looks at how the metric compares to the balance of that ratio before industrialization.
"The new study means that aviation's impact on climate change can be compared with other sectors such as maritime shipping, ground transportation and energy generation as it has a consistent set of ERF measurements," said Lee in a statement.
The researchers found that aviation's contribution of 3.5 percent of the human activity that drives the climate crisis remained fairly constant from 2000 to 2018. However, that does not mean that aviation didn't change over that period. What it means is that while aviation was contributing more and more to the climate crisis, other factors were as well.
"It's the growth that is the real feature," said Lee, as The New Scientist reported. "It is rising quite dramatically."
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By Gwen Ranniger
Fertility issues are on the rise, and new literature points to ways that your environment may be part of the problem. We've rounded up some changes you can make in your life to promote a healthy reproductive system.
Infertility and Environmental Health: The Facts
<ul> <li>Sperm count is declining steeply, significantly, and continuously in Western countries, with no signs of tapering off. Erectile dysfunction is on the rise, and women are facing increasing rates of miscarriage and difficulty conceiving.</li><li>Why? A huge factor is our environmental health. Hormones (particularly testosterone and estrogen) are what make reproductive function possible, and our hormones are increasingly being negatively affected by harmful, endocrine-disrupting chemicals commonplace in the modern world—in our homes, foods, and lifestyles.</li></ul>What You Can Do About It
<p>It should be noted that infertility can be caused by any number of factors, including medical conditions that cannot be solved with a simple change at home.</p><p><em>If you or a loved one are struggling with infertility, our hearts and sympathies are with you. Your pain is validated and we hope you receive answers to your struggles.</em></p><p>Read on to discover our tips to restore or improve reproductive health by removing harmful habits and chemicals from your environment.</p>Edit Your Health
<ul><li>If you smoke, quit! Smoking is toxic, period. If someone in your household smokes, urge them to quit or institute a no-smoking ban in the house. It is just as important to avoid secondhand smoke.</li><li>Maintain a healthy weight. Make sure your caloric intake is right for your body and strive for moderate exercise.</li><li>Eat cleanly! Focus on whole foods and less processed meals and snacks. Studies have found that eating a Mediterranean-style diet is linked to increased fertility.</li><li>Minimize negative/constant stress—or find ways to manage it. Hobbies such as meditation or yoga that encourage practiced breathing are great options to reduce the physical toll of stress.</li></ul>Edit Your Home
<p>We spend a lot of time in our homes—and care that what we bring into them will not harm us. You may not be aware that many commonly found household items are sources of harmful, endocrine-disrupting compounds. Read on to find steps you can take—and replacements you should make—in your home.</p><p><strong>In the Kitchen</strong></p><ul> <li>Buy organic, fresh, unprocessed foods whenever possible. <a href="https://www.ehn.org/clean-grocery-shopping-guide-2648563801.html" target="_blank">Read our grocery shopping guide for more tips about food.</a></li><li>Switch to glass, ceramics, or stainless steel for food storage: plastics often contain endocrine-disrupting chemicals that affect fertility. <a href="https://www.ehn.org/bpa-pollution-2645493129.html" target="_blank" rel="noopener noreferrer">Learn more about the dangers of plastic here.</a></li><li>Ban plastic from the microwave. If you have a plastic splatter cover, use paper towel, parchment paper, or an upside-down plate instead.</li><li>Upgrade your cookware: non-stick may make life easier, but it is made with unsafe chemical compounds that seep into your food. Cast-iron and stainless steel are great alternatives.</li><li>Filter tap water. Glass filter pitchers are an inexpensive solution; if you want to invest you may opt for an under-the-sink filter.</li><li>Check your cleaning products—many mainstream products are full of unsafe chemicals. <a href="https://www.ehn.org/how-to-shop-for-cleaning-products-while-avoiding-toxics-2648130273.html" target="_blank" rel="noopener noreferrer">Check out our guide to safe cleaning products for more info</a>.</li></ul><p><strong>In the Bathroom </strong></p><ul> <li>Check the labels on your bathroom products: <em>fragrance-free, paraben-free, phthalate-free</em> and organic labels are all great signs. You can also scan the ingredients lists for red-flag chemicals such as: triclosan, parabens, and dibutyl phthalate. Use the <a href="https://www.ewg.org/skindeep/" target="_blank">EWG Skin Deep database</a> to vet your personal products.</li><li>Ditch the vinyl shower curtain—that new shower curtain smell is chemical-off gassing. Choose a cotton or linen based curtain instead.</li><li>Banish air fresheners—use natural fresheners (an open window, baking soda, essential oils) instead.</li></ul><p><strong>Everywhere Else</strong></p><ul><li>Remove wall-to-wall carpet. If you've been considering wood or tile, here's your sign: many synthetic carpets can emit harmful chemicals for years. If you want a rug, choose wool or plant materials such as jute or sisal.</li><li>Prevent dust build-up. Dust can absorb chemicals in the air and keep them lingering in your home. Vacuum rugs and wipe furniture, trim, windowsills, fans, TVs, etc. Make sure to have a window open while you're cleaning!</li><li>Leave shoes at the door! When you wear your shoes throughout the house, you're tracking in all kinds of chemicals. If you like wearing shoes inside, consider a dedicated pair of "indoor shoes" or slippers.</li><li>Clean out your closet—use cedar chips or lavender sachets instead of mothballs, and use "green" dry-cleaning services over traditional methods. If that isn't possible, let the clothes air out outside or in your garage for a day before putting them back in your closet.</li><li>Say no to plastic bags!</li><li>We asked 22 endocrinologists what products they use - and steer clear of—in their homes. <a href="https://www.ehn.org/nontoxic-products-2648564261.html" target="_blank">Check out their responses here</a>.</li></ul>Learn More
<ul><li>For more information and action steps, be sure to check out <em>Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race</em> by EHS adjunct scientist Shanna Swan, PhD: <a href="https://www.shannaswan.com/" target="_blank" rel="noopener noreferrer">available for purchase here.</a></li><li><a href="https://www.ehn.org/st/Subscribe_to_Above_The_Fold" target="_blank" rel="noopener noreferrer">Sign up for our Above the Fold Newsletter </a>to stay up to date about impacts on the environment and your health.</li></ul>EcoWatch Daily Newsletter
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