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Author(s): Peter H. Gleick
Like tens of millions of other Americans, I’m a birder. Last week, my wife, son and I watched waves of raptors and shorebirds flying south past the Golden Gate and San Francisco Bay. These birds — born in the Arctic, Alaska, and the forests of Canada and North America — take off each year on journeys that often extend for thousands of miles, down the four ancient flyways along the Pacific Coast, through the Great Plains and the Mississippi River Basin, or down the Eastern Seaboard, before reaching their wintering grounds in Central and South America.