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A truck containing used plastic bottles travels along a highway covered in haze in Beijing on December 5, 2011.LIU JIN/AFP/Getty Images

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Cars travel on the second ring road as pollution reaches what the US Embassy monitoring station says are "Hazardous" levels in Beijing on December 5, 2011.MARK RALSTON/AFP/Getty Images

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A man (C) rides a tricycle across a bridge covered in the haze in Beijing on December 5, 2011.LIU JIN/AFP/Getty Images

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Buildings in Beijing are pictured on a day with heavy haze and smog October 29, 2011.Jason Lee/Reuters

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A woman waits for a bus as rush hour traffic passes on a clear evening in Beijing on December 18, 2011.ED JONES/AFP/Getty Images

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A Chinese motorist wears a mask as she makes her way along a smog filled road in Hefei, east China's Anhui province on November 29, 2011. The amount of global warming gases sent into the atmosphere made an unprecedented jump in 2010, according to the US Department of Energy's latest world data on carbon dioxide emissions, with China alone was the biggest polluter with a spike of 212 million metric tons in 2010 over 2009.STR/AFP/Getty Images

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