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A woman walks on a bridge over a polluted river at a suburban area of Wenzhou, in Zhejiang province February 18, 2011. China is now the world's second largest economy, but hundreds of millions of its people still rely on fouled water that will cost billions of dollars to clean. Growing cities, overuse of fertilisers, and factories that heedlessly dump wastewater have degraded China's water supplies to the extent that half the nation's rivers and lakes are severely polluted. (Photo by Carlos Barria/Reuters)
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