From USA Today:
U.S. Geological Survey data released Wednesday shows [Glacier National Park’s] 37 glaciers, along with two others on federal Forest Service land, have shrunk an average of about 40% since 1966... In fact, they'll all be gone within our lifetime, warns Daniel Fagre, a research ecologist with the USGS's Northern Rocky Mountain Science Center... Some masses deteriorated so much, they're no longer large enough to be considered glaciers, which must be at least 25 acres. Some of the glaciers lost up to 85% of their mass.