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GR: Scientists have used repeated photographs to study glaciers for more than a century (Rogers et al. 1984). Arthur Johnson published the earliest photographic study of glacier change in Glacier National Park in 1980 (U. S. Geological Survey Professional Paper 1180, 29 pp.). By 1980, the glaciers had already begun melting and shrinking. The photos in this article show that all the glaciers in Glacier National Park will soon be gone. As pointed out elsewhere, mountain glaciers store winter precipitation and release it during summer months. With more precipitation falling in winter as rain instead of snow, less water is stored in glacial ice, and this leads to shortages during summer.

“As the National Park Service turns 100, we’re looking at how climate change affects our shared heritage and what the agency is doing about it. This is our fourth story in a series.

“National Parks have…