Park Service Fracking

November 27, 2013 - 2:35 PM
FILE - In this June 25, 2012 file photo, a crew works on a gas drilling rig at a well site for shale based natural gas in Zelienople, Pa. The National Park Service says it is withdrawing "inappropriate" comments about a proposed rule regulating hydraulic fracturing operations on public lands. (AP Photo/Keith Srakocic, File)