Global warming threatens pine forests, forcing federal officials to shift strategy

ROCKY MOUNTAIN NATIONAL PARK — A few modest features distinguish the trunk of the limber pine standing among the trees near abandoned beaver ponds: a white, plastic pouch attached by a removable staple, a numerical metal tag secured with an aluminum nail and a printed warning: “Pouches on trees to repel mountain pine beetles. Pouches contain chemicals. Do Not Touch-Do Not Remove.”
The conifer, with its accoutrements, represents a small salvo in the battle against a beetle infestation, fueled partly by warmer temperatures. But it is also a larger symbol of how researchers from the Forest Service — in concert with National Park Service officials and other scientists — are working to steel high-elevation pine forests in the West against the onslaught of climate change.