CLEAN WATER: A boy drinks water from a communal clean water source next to a contaminated river in Masiphumelele, Cape Town, South Africa. (Photo: ZUMA Press)

洁净水：在南非开普敦的马斯弗梅勒勒，一个小男孩正在喝水，水来自毗邻一条受污染河流的社区洁净水源。

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The Mayak nuclear complex, located some 18 miles (30 kilometers) from the village, has made the river and its environs one of the most contaminated nuclear waste sites on Earth.

玛雅克核设施与村子相距约18英里(30公里)，它的存在使得河流和周围区域变成地球上受核废料污染最严重的地方之一。

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The local diet relies heavily on fish, but there are concerns that river fish are contaminated with mercury.

当地居民的饮食习惯对鱼的依赖性极高，但近来不断有声音指出河中的鱼类被水银污染了。

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The base, which housed peacekeepers from Nepal - where cholera is endemic - had leaking sewage pipes which contaminated a river system.

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Each group should research the location of the river, its benefits to people and animals, the current condition of the river and the potential effects on the river's ecosystem and the local community if the river were to become contaminated.

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Transatlantic tales of overflowing lagoons depositing industrial quantities of waste into local rivers and waterways do little to inspire confidence (one spill in 2005 killed 375, 000 fish and contaminated a 20-mile stretch of a river in New York state).

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