FILE - This Aug. 1, 2011 file photo, shows whitebark pine that have succumbed to mountain pine beetles through the Gros Ventre area east of Jackson Hole, Wyo. U.S. officials say climate change, beetles and a deadly fungus are imperiling the long-term survival of the high-elevation tree found in the western U.S. (Rick Egan/The Salt Lake Tribune via AP, File)
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