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6 March 2014 1:04 pm ,
Vol. 343 ,
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: Contrails Warm the Globe
27 June 2011 2:52 pm
The white, cloudy contrails airplanes often leave in the sky may be full of ice crystals, but they're warming the globe, according to a new study. By flying in the wake of various aircraft—ranging in size from the 47-metric-ton Airbus A319 to the 508-metric-ton Airbus A380 (contrails of two Airbus A340s shown)—and analyzing their less-than-10-minute-old contrails, researchers have found that fresh contrails tend to trap outbound infrared radiation, slightly heating Earth. Based on 2005 air traffic figures such contrails, if their effect were to be evenly spread out across the globe, would continuously trap 15.9 milliwatts of power per square meter, the researchers report this month in Geophysical Research Letters. That's about 1% of the amount trapped by the carbon dioxide added to the atmosphere since the beginning of the Industrial Revolution.
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