Dams alter river temperatures and endanger fish, yet 3,700 more will be built

The ubiquitous dams around the world are built to guard against extreme flooding, meet steadily increasing water demands and provide hydroelectric power. They also alter river ecosystems — such as by changing temperatures downstream — and can substantially change nearby fish populations.

In China, the Xinanjiang and Danjiangkou hydroelectric dams caused the peak summer temperature to decrease ... 

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Ethiopia begins second stage of filling mega-dam, angering Egypt

“Egypt, which depends on the Nile for about 97% of its irrigation and drinking water, sees the dam as an existential threat.”

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