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This picture taken on on March 12, 2013 shows dead pigs lying on rocks next to a dirty tributary of the Yangtze River in a village in Yichang, in central China's Hebei province, some 1,200 kms from the eastern city of Shanghai. Meanwhile, the number of dead pigs found in the Huangpu river running through China's commercial hub Shanghai has reached more than 13,000, state media said on March 18, as mystery deepened over the hogs' precise origin. GRAPHIC CONTENT CHINA OUT AFP PHOTOSTR/AFP/Getty Images
This picture taken on on March 12, 2013 shows dead pigs lying on rocks next to a dirty tributary of the Yangtze River in a village in Yichang, in central China's Hebei province, some 1,200 kms from the eastern city of Shanghai. Meanwhile, the number of dead pigs found in the Huangpu river running through China's commercial hub Shanghai has reached more than 13,000, state media said on March 18, as mystery deepened over the hogs' precise origin. GRAPHIC CONTENT CHINA OUT AFP PHOTOSTR/AFP/Getty Images

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Pollution an economic concern in China

CNN's Philippe Cousteau speaks about Chinese pollution and what can be done to clean up the environmental problems.

Pollution an economic concern in China

CNN's Philippe Cousteau speaks about Chinese pollution and what can be done to clean up the environmental problems.