“The most visible effect of global warming in Montana, and perhaps anywhere in the world, is in Glacier National Park. While glaciers all over the world are in retreat—on Mt. Kilimanjaro, in the Andes and Alps, on the mountains of New Guinea, and around Mt. Everest—the phenomenon has been especially well studied in Montana because its glaciers are so accessible to climatologists and tourists. When the area of Glacier National Park was first visited by naturalists in the late 1800s, it contained over 150 glaciers; now, there are only about 35 left, mostly at just a small fraction of their first-reported size. At present rates of melting, Glacier National Park will have no glaciers at all by the year 2030. Such declines in the mountain snowpack are bad for irrigation systems, whose summer water comes from melting of the snow”