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Trees boost air pollution--and cool temperatures--in U.S. Southeast

Why is the southeastern U.S. getting cooler while the rest of the globe is warming? Thank the trees, say some researchers.

On sweltering summer days, trees and other plants emit volatile organic compounds, such as isoprene, which combine with manmade soot and other aerosols in the atmosphere to produce a cooling haze, says environmental scientist Allen Goldstein of the University of California, Berkeley...

May 18, 2009 — David Biello

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