In this March 25, 2014 photo, a worker watches over a hydraulic fracturing operation at an Encana Corp. oil well, near Mead, Colo. In the background is a tall canvas wall around the perimeter of the ... more 
In this March 25, 2014 photo, a worker watches over a hydraulic fracturing operation at an Encana Corp. oil well, near Mead, Colo. In the background is a tall canvas wall around the perimeter of the extraction site, which mitigates noise, light and dust coming from the operation during the drilling and completion phase, which generally takes a few weeks. (AP Photo/Brennan Linsley) less 
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Associated Press | Photo By Brennan Linsley
Thu, Apr 17, 2014 6:15 PM EDT