A study is expected to suggest that shale gas has a worse life-cycle emissions footprint than coal, which could cause some environmentalists to rethink their support for gas-powered generation. The study hasn't been released, but the study's author has said that methane released during hydraulic fracturing could offset natural gas's carbon edge. "If verified by other scientific studies, the finding could force a major rethink of the use of shale gas as a tool in our kit to combat climate change," warns Alexis Madrigal.

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