Thousands of pigs were found dead in rivers supplying Shanghai's water, a grisly discovery that has drawn attention again to China's toxic pollution, which contributes to some 700,000 deaths each year. Here are some points of concern: waste Tai Lake-a massive basin that holds China's third largest body of freshwater, providing water for 30 million people-has been classified as a major natural disaster by Beijing after decades of toxic contamination.
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