31 May 2012:
Geoengineering Scheme Could
Make Sky Brighter and Whiter, Study Says
Spraying aerosols into the atmosphere, one of the so-called geoengineering schemes often proposed as a way to counteract global warming, would also make the daytime sky significantly brighter and whiter
, according to a new study. Using sophisticated models, researchers estimated that a 2-percent
reduction in the sun’s light — which would be approximately enough to offset warming in the case of a doubling of atmospheric concentrations of carbon dioxide — would have the side-effect of making the sky three to five times brighter. Depending on the size of the sulfate-based aerosol particles, the sky would become whiter during the day and trigger the types of vivid sunsets often seen following large volcanic eruptions. While the sky would still be blue, the researchers say, it would be a lighter shade than most people are used to — and more similar to the sky colors seen over urban areas. “These results give people one more thing to consider before deciding whether we really want to go down that road,” said Ben Kravitz, a researcher at the Carnegie Institution for Science and co-author of the study, published in the journal Geophysical Research Letters
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A look at how acidifying oceans could threaten the Dungeness crab, one of the most valuable fisheries on the U.S. West Coast. Watch the video.
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An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
An indigenous tribe’s deadly fight to save its ancestral land in the Amazon rainforest from logging. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
Residents of the Chocó Rainforest in Ecuador are choosing to plant cacao over logging in an effort to slow deforestation.
Watch the video.
Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.