Issue Date: August 24, 2009
Reining In Brown Clouds
Across parts of Earth are massive swaths of brownish air covering thousands of square miles. Thick with lung-choking pollutants, these so-called brown clouds dim the surface below them and contain particles that are potent agents of global warming. In addition, some scientists say brown clouds are altering regional precipitation patterns in Asia.
Calls are growing to clean up emissions that form brown clouds. This, proponents says, will help curb global warming in the short term, . . .
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