Energy In Depth Funded By Encana, Halliburton etc.
The source(s) that Roblov1 and LordObama are placing so much weight in are from Energy in Depth.
You might want to consider the source, then.
Energy in Depth
XTO is a funder of Energy in Depth (EID), a pro-oil-and-gas drilling industry front group formed by the American Petroleum Institute, the Independent Petroleum Association of America (IPAA) and dozens of additional industry organizations for the purpose of denouncing legislation proposed by Colorado U.S. Rep. Diana DeGette to regulate underground hydraulic fracturing fluids.[10]
EID is also funded by the El Paso Corporation, Occidental Petroleum, BP, Anadarko, Marathon, EnCana, Chevron, Talisman, Shell, API, the Independent Petroleum Association of America, Halliburton, Schlumberger and the Ohio Oil and Gas Association.[11]
http://www.sourcewatch.org/index.php/XTO_Energy