According to a study by the National Wind Coordinating Committee, "Based on current projections of 3,500 operational wind turbines in the US by the end of 2001, excluding California, the total annual mortality was estimated at approximately 6,400 bird fatalities per year for all species combined." Let's say they lowballed things, they underestimated the number of turbines, underestimated the number of birds per turbine, and are sops to the wind industry. Let's double their number ... no, triple it. No, quadruple! Let's say turbines kill 25,000 birds a year. According to the National Audubon Society, house cats kill 100,000,000 birds …
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David Roberts is a staff writer for Grist. You can follow his Twitter feed at twitter.com/drgrist.