In this March 25, 2014 photo, workers talk during a hydraulic fracturing operation at an Encana Corp. well pad near Mead, Colo. Hydraulic fracturing, or “fracking,” can greatly increase the ... more 
In this March 25, 2014 photo, workers talk during a hydraulic fracturing operation at an Encana Corp. well pad near Mead, Colo. Hydraulic fracturing, or “fracking,” can greatly increase the productivity of an oil or oil well by splitting open rock with water and/or sand pumped underground at high pressure. (AP Photo/Brennan Linsley) (AP Photo/Brennan Linsley) less 
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Associated Press | Photo By Brennan Linsley
Thu, Apr 17, 2014 6:12 PM EDT