The salmon look stressed. Behind the algae-streaked windows at Seattle's Hiram Chittenden fish ladder they're bumping heads, flipping in the current, and pointing their narrow jaws upstream. To get
An area that produces more than half of China's grain is losing its water.
Manipulation of water flows to and from land is as old as settled agriculture. Irrigation and river management practices are found widely across the ancient human world, constituting one of the most
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