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CO2 levels in atmosphere rising at dramatically faster rate, U.N. report warns - The Washington Post
Greenhouse gases reached historic highs in 2013, a U.N. report says, in part because of rising emissions from automobiles and smokestacks. (Mark Ralston/AFP/Getty Images) By Joby Warrick September 9 Follow @jobywarrick Levels of heat-trapping carbon dioxi
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