Glacier Photograph Collection
http://nsidc.org/data/glacier_photo/repeat_photography.html

National Snow and Ice Data Center


These repeat photographs (also known as glacier pairs) are of special interest to scientists studying glaciers and climate. Glacier photographs taken from the same vantage point, but years apart in time, can reveal dramatic changes in the glacier terminus position, as a glacier either advances or retreats. Most glaciers around the world have retreated at unprecedented rates over the last century. These pairs of photographs can provide striking visual evidence of climate change.

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This resource is referenced here:
Subject: Environmental Science:Global Change and Climate