** FILE ** In this Wednesday, March 13, 2013, file photo, a worker in protective clothing prepares to haul away dead pigs pulled from a river along Zhonglian village of Jinshan district in Shanghai. (AP Photo/File)

** FILE ** In this Wednesday, March 13, 2013, file photo, a worker in protective clothing prepares to haul away dead pigs pulled from a river along Zhonglian village of Jinshan district in Shanghai. (AP Photo/File)