Environment
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With more than 12 million cars sold in China last year, motor vehicles have emerged as the chief culprit for the throat-choking air pollution in big cities, including Beijing. (ASSOCIATED PRESS)
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VISIBLE CHANGE: Beijing's Tiananmen Square is filled with smog from industrial emissions. For the past seven years, China has surpassed the U.S. to become the world's biggest emitter of carbon dioxide and other greenhouse gases. (Associated Press)
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National Edition News Cover for December 9, 2013 - Inconvenient Truth: A woman wearing a mask walk through a street covered by dense smog in Harbin, northern China, Monday, Oct. 21, 2013. Visibility shrank to less than half a football field and small-particle pollution soared to a record 40 times higher than an international safety standard in one northern Chinese city as the region entered its high-smog season. (AP Photo/Kyodo News)
