Natural gas from shale formations comprised 23 percent of total U.S. production in 2010, according to the U.S. Department of Energy’s Energy Information Administration.
Shale gas output was 4.87 trillion cubic feet in 2010. That's a 57 percent increase from the 3.11 trillion ft3 produced in 2009.
Technically recoverable shale gas resources totaled 5,760 trillion ft3. When the U.S.’s estimate of 862 trillion ft3 is added, it brings the total world shale resource base estimate to 6,622 trillion ft3. That potentially can supply the U.S. with natural gas for another 250 to 300 years at current consumption rates.
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