FILE - In this March 25, 2014 file photo, a worker adjusts pipes during a hydraulic fracturing operation at a well pad near Mead, Colorado. During EPA hearings on methane in Denver Wednesday, Sept. 23, 2015, an energy industry representative told the Environmental Protection Agency that over-regulating methane emissions could discourage the use of environment-friendly natural gas. However, a former Colorado air quality official countered that such controls would be a cost-effective way to fight climate change. (AP Photo/Brennan Linsley, file)