(Photograph by Harald Sund/Getty Images)From Popular Mechanics:
Natural gas prices are at a six-year low, but that's not slowing one unconventional—and historically costly—method for extracting gas for energy. Shale gas reserves are contributing to the 11 percent rise in natural gas production the United States has seen in the past two years. But the deposits have been known about for decades—why are these resources drawing attention now?
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