josh fox's 2010 academy award nominated film "gasland" became a center of opposition to hydraulic fracturing of shale. the movie presented problems with groundwater contamination near well sites in pennsylvania, wyoming, and colorado. "energy in depth", an oil and gas industry lobbying group, called the film's facts into question. in response, a rebuttal of "<nowiki>energy in depth'</nowiki>"s claims of inaccuracy was posted on "gasland's" website. the director of the colorado oil and gas conservation commission (cogcc) offered to be interviewed as part of the film if he could review what was included from the interview in the final film but fox declined the offer. exxon mobil, chevron corporation and conocophillips aired advertisements during 2011 and 2012 that claimed to describe the economic and environmental benefits of natural gas and argue that hydraulic fracturing was safe.