"The hot dry seasons of the past few years have caused rapid disintegration of glaciers in Glacier National Park, Montana...Sperry Glacier...has lost one-quarter or perhaps one-third of its ice in the past 18 years... If this rapid rate should continue...the glacier would almost disappear in another 25 years..." "Born about 4,000 years ago, the glaciers that are the chief attraction in Glacier National Park are shrinking so rapidly that...