We still are no where near numbers of birds that cats kill. Cat kills are in the billions world wide. Wind turbine kills aren't. Bats - sorry no answer to that. As I am no scientist, would it not be possible to put a light weight grill (pretty much as your desktop fan) to stop this without causing too much drag and affecting efficiency of the turbine?
I really am sorry to say that if one of the reasons to stop having wind turbines is bird/bat kills then there isn't much hope for us all. There are always winners and losers. Perhaps we should ban driving cars because they kill more foxes every year than hunting ever did.
The Birdchaser: Cats Kill Over 1 Billion Birds Each Year in U.S.
Feral Cats Kill Birds: The Issue of Feral and Roaming Domestic Cats and the Birds That They Kill
On the prowl
http://www.abcbirds.org/abcprograms/.../predation.pdf


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good job
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