Threatened Pine Tree Grizzlies

FILE - In this Aug. 1, 2011 file photo, Whitebark pine have succumbed to mountain pine beetles through the Gros Ventre area east of Jackson Hole, Wyo. US officials say climate change, beetles and a deadly fungus are imperiling the long-term survival of the high-elevation pine tree that's a source of food for threatened grizzly bears. (AP Photo/The Salt Lake Tribune, Rick Egan, File)