The Glacier National Park is a fitting emblem for the great changes sweeping the world's cold places. Only 27 glaciers are left in the park out of the 150 that existed there a century ago, 90 percent of the ice volume is gone. It is estimated that the remainder will vanish at the rate of one per year, on average. It will be the first time in 7,000 years that this landscape has not had glaciers.