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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) JAPAN OUT, MANDATORY CREDIT

A child drinks water near a stream in Fuyuan county, Yunnan province March 20, 2009. World Water Day will be observed on March 22. Picture taken March 20, 2009. (Photo by Reuters/Stringer)

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Image #: 21788013 The sun sets behind the brown coal power plant Neurath near Grevenbroich, Germany, 27 March 2013. Photo: Federico Gambarini DPA /LANDOV