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November 3, 2011
By Brian Merchant
http://www.treehugger.com/energy-disasters/fracking-may-have-already-caused-50-earthquakes-oklahoma.html

martinluff via Flickr/CC BY 2.0
In a surprising turn of events, Cuadrilla Resources, a British energy company, recently admitted that its hydraulic fracturing operations "likely" caused an earthquake in England. Predictably, this news quickly sent a shockwave through the U.K., the oil and natural gas industries, and the environmental activist community. And it certainly feeds plenty of speculation that the same phenomenon could be occurring elsewhere.