Shale gas, natural gas produced by hydraulic fracturing or fracking, has positively changed electricity production and the environment in the United States. Shale gas provides reliable, scalable electricity generation and is the dominate fuel used in the United States.
Recently greenhouse gas emission levels have declined in the U.S., and the primary reason is the switch from coal to natural gas in the power generation industry. It has the potential to change global energy markets and lower global greenhouse gas emissions.
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Source: delmarva now.