YELLOWSTONE NATIONAL PARK -- A history of fire suppression, an invasive fungal plague, and rampant insect infestation fueled by global warming add up to likely extinction for the whitebark pine and serious trouble for the grizzly bear and other species that depend on it, some scientists say. That sets the stage for problem No. 2: white pine blister rust, an exotic species native to Eurasia and inadvertently introduced to western North America in 1910 near Vancouver, British Columbia... As the fungal disease spreads south and east, it leaves behind “ghost” forests, Tomback said -- stands of dead whitebark pine and...