Buildings are seen through a heavy haze in Beijing in this Aug. 8, 2007, file photo. According to a study, overseen by the National Academy of Sciences, the result of a 2-1/2 year collaboration between U.S. and Chinese academies of engineering and sciences, China is the world's biggest emitter of sulfur dioxide; both countries lead the world in their emissions of industrial carbon dioxide, a heat-trapping gas blamed for warming the atmosphere like a greenhouse.
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