A natural gas drilling rig just east of downtown Fort Worth, Texas. A new decade-long study finds the region's Barnett Shale formation has sufficient gas reserves to last another 25 years.
David Kent/MCT/Landov/Fort Worth Star Telegram
Iowa Gov. Terry Branstad (left), Indiana Gov.-Elect Mike Pence (center) and Virginia Gov. Bob McDonnell, chairman of the Republican Governors Association, participate in a panel discussion during the 2012 RGA Annual Conference on Thursday in Las Vegas.