Hydraulic fracturing

Associated Press
In this March 29, 2013 photo, workers tend to a well head during a hydraulic fracturing operation at an Encana Oil & Gas (USA) Inc. gas well outside Rifle, in western Colorado. The first experimental hydraulic fracturing occurred in 1947. More than 1 million U.S. oil and gas wells have been fracked since, according to the American Petroleum Institute. (AP Photo/Brennan Linsley)

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The deep injection of wastewater underground by energy companies during methane gas extraction has caused a dramatic rise in the number of earthquakes in Colorado and New Mexico since 2001, U.S. government scientists said in a study released on Monday, Sept. 15, 2014. (Reuters)

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