The U.S. Fish and Wildlife Service estimates more than 400,000 birds are killed each year by wind turbine blades. This figure is expected to rise as more wind power projects are built across the country. According to the American Bird Conservancy, three American bird species are being threatened because of their migratory habits: golden eagles, whooping cranes, and the greater sage-grouse. Other birds that have fallen victim to wind turbine blades include red-tailed hawks and burrowing owls.
The wind turbine that kills the most birds is a 20-year old type that rotates quickly and does not allow the birds to navigate the moving turbines. Today's 1.5-mW high-capacity wind turbines turn comparatively slowly, kind of like your bicycle wheel at the highest gear. Birds can usually dodge these slow-moving blades.
It seems that bird migration and topographic features are now being taken into consideration as the use of wind energy moves forward. This site gives a nice explanation of the issues of Birds and Wind Power and a list of the gravest dangers birds face every day. The data indicates that glass windows and electric transmission lines cause the most deaths.
Of course, any death of an endangered species is one too many. The question is then: does the impact on birds outweigh the environmental savings and benefits of wind energy? Are there ways to further improve this type of energy? How does wind power compare to the environmental impact of one oil spill or one nuclear reactor incident?
What are your thoughts?
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American Bird Conservancy
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