
Hydraulic fracturing, the method used to extract oil and natural gas from shale formations deep underground, has gone from a niche activity to the process responsible for more than two-thirds of U.S. gas supply. Fracking now accounts for 67 percent of marketed gas output, up from less than 7 percent in 2000, according to the U.S. Energy Information Administration.
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http://snapzu.com/Borska/two-thirds-of-us-gas-supply-now-comes-from-fracking
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