Fact one: Wind energy is booming around the world. Fact two: Wind turbines kill lots of bats. Fact three: Bats are worth billions to North American agriculture. Conclusion? Wind power has a bat problem. And with the Global Wind Energy Council predicting that worldwide wind capacity will double by 2016, the problem will only get worse. At a handful of U.S. sites, such concerns have already led planned wind facilities to be scaled back or put on hold.