FILE - In this undated file photo the Trans-Alaska pipeline and pump station north of Fairbanks, Alaska is shown. Environmental groups have petitioned the U.S. Department of Interior to review climate impacts related to the decades-old trans-Alaska pipeline system. They're also asking the federal government to develop a plan for a "managed phasedown" of the 800-mile pipeline, which is Alaska's economic lifeline. (AP Photo/Al Grillo, File)
FILE - The trans-Alaska pipeline is seen next to the Dalton Highway north of Fairbanks, Alaska, Aug 10, 2005. Environmental groups have petitioned the U.S. Department of Interior to review climate impacts related to the decades-old trans-Alaska pipeline system. They're also asking the federal government to develop a plan for a "managed phasedown" of the 800-mile pipeline, which is Alaska's economic lifeline. (AP Photo/Al Grillo, File)