For all the talk and clamor about wind turbines causing thousands of bird deaths, it should be remembered that bird death due to other human factors kill a lot more birds, Cars, cats allowed to roam neighborhood and glass windows probably cause far more bird deaths that wind turbines ever will.
Check this out: “Estimates are that between 100 million and 1 billion individual birds are killed annually by collisions with windows in the United States alone.” –from Window Glass: Silent Bird Killer? | Cool Green Science: The Conservation Blog of The Nature Conservancy "Birds just do not get the concept of “glass.” We’ve all surely had the experience of having a bird fly into a window at our home, office or school, usually with unfortunate consequences for the bird. But have you ever stopped to think about how widespread this phenomenon is and how many birds it might be killing annually? " The Nature Conservancy - Protecting Nature, Preserving Life