Shale natural gas has a key role in the U.K.'s energy mix as it could spur economic growth and strengthen energy security, but it isn't a "quick fix" and is "no silver bullet," said Ed Davey, the U.K.'s energy and climate change secretary. The Bowland Shale play in the U.K. is estimated to hold 1.3 quadrillion cubic feet of natural gas, according to the British Geological Survey.

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