Red Shoulder Hawk

Red Shoulder Hawk

Friday, April 15, 2005

Dam!

Christer Nilsson, professor at the Department of Ecology and Environmental Science, Umeå University, led a study to map all the world's dams. The team found that today, there are more than 45,000 dams over 15 meters high. Together they can store more than 15 percent of the annual freshwater runoff in the world.

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