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. The study by U.S. Geological Survey researchers is the latest to link energy production methods to an increase in quakes in regions where those techniques are used. Energy companies began producing coal-bed methane in Colorado in 1994, then in New Mexico five years later.
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