BILLINGS, Mont. — Climate change, voracious beetles and disease are imperiling the long-term survival of a high-elevation pine tree that’s a key source of food for some grizzly bears and found ...

Over the past decade the Mountain Pine Beetle (Dendrocthonus ponderosae) has killed millions of pine trees from New Mexico to the Yukon Territory, as a result of an unprecedented explosion in their ...

Table mountain pine has thick, platy bark that is grayish brown to black. The needles of this tree range from yellow to green; they are twisted, and borne into groups of two.

Environmentalist David Gonzales, of Jackson, Wyo., looks up at a dead whitebark pine tree in the mountains east of Jackson Hole, Wyo., in June 2010.

BILLINGS, Mont. (AP) — Climate change, voracious beetles and disease are imperiling the long-term survival of a high-elevation pine tree that’s a key source of food for some grizzly bears and ...