Carbon emissions in the U.S. have hit a 20-year low due to a supposedly environmentally unfriendly drilling technique that has created an abundance of cheap natural gas. The free market, it seems, does it better than the EPA. Environmentalists find themselves between shale rock and a hard place after a little noticed technical report documented how the natural gas boom caused by the use of hydraulic fracturing, or fracking, has actually helped the environment in a major way while also creating jobs and economic growth. In the report, the U.S. Energy Information Agency, a part of the Energy Department, said...