WALTER RUSSELL MEAD: Shale Gas Is Fracking Green.

Ask a green what he or she thinks about fracking, and you’re likely to get an earful of criticism about methane leaks, poisoned groundwater, and climate change disaster. But a new report from the ecologically minded Breakthrough Institute (BI) makes the case that shale gas actually has a net environmental benefit. Nevermind the boosts to our energy security, and economy that fracking provides; the controversial drilling process is worth embracing on green merits alone.

Natural gas’s biggest green qualification is the extent to which it displaces coal as an energy source. Burning coal emits roughly twice as much greenhouse gas into the air as natural gas. Thanks to the shale boom, we’re getting less of our electricity from coal-fired power plants and more from natural gas. The BI notes, “From 2008 to 2012, annual coal consumption for US electric power declined, on average, by 50 million tons.” That’s something greens should be cheering, and it’s mostly thanks to fracking.

But natural gas doesn’t just beat coal on carbon emissions. The BI explains why, at the local level, shale gas does less harm than coal.