It’s no secret that wind power has experienced a boom in recent years, as demand for renewable energy sources grows. But while the technology is adept at helping curb greenhouse-gas emissions, the thousands of new turbines popping up around the globe do have some drawbacks.Wind farms have a long-documented history of killing hundreds of thousands of birds and bats each year. As it turns out, the bat toll may be higher than previously estimated.In a study published Monday, researchers in the United Kingdom found that environmental impact assessments — the main tool used to predict the ecological effects of a new energy development — commonly failed to predict the number of bats that would have fatal collisions with wind turbines’ spinning blades. Even in the few cases where researchers said early assessments accurately predicted the danger to bats, efforts to mitigate those risks often did not succeed.

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