The thick green waters of Lake Chaohu

By Guido Trombetta on 10:54 PM ,
Lake Chaohu
photo by AFP/Getty Images

In the picture above you can see small fishing boats tied to the banks of the Chaohu lake, where a pollution-linked algae bloom has reappeared, in Hefei, eastern China's Anhui province on June 4, 2008. Algae blooms are common on many Chinese freshwater lakes and are chiefly caused by untreated sewage containing high concentrations of nitrogen, a main ingredient in detergents and fertilisers, as more than 70 percent of China's waterways and 90 percent of its underground water have been contaminated by pollution. In the following images you'll see Chinese farmers trying to clean up the lake.

Lake Chaohu
photo by AFP/Getty Images

Lake Chaohu
photo by AFP/Getty Images

Lake Chaohu
photo by AFP/Getty Images

Lake Chaohu
photo by AFP/Getty Images

Lake Chaohu
photo by AFP/Getty Images

Lake Chaohu
photo by AFP/Getty Images

Lake Chaohu
photo by AFP/Getty Images

Lake Chaohu
photo by Reuters

Lake Chaohu
photo by Reuters

The two following pictures instead, are three months old and show Chinese authorities releasing algae-munching fishes into the Chaohu lake after a previous algae bloom. The algae-munching fish, after their diet of toxins, will be sold on to consumers, as more than 1.6 million silver carp fry have been introduced into Chaohu lake.

Lake Chaohu
photo by AFP/Getty Images

Lake Chaohu
photo by AFP/Getty Images

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