![]() ![]() Maurer is the lead author of a study using satellite imagery to show that in the past 20 years, Himalayan glaciers melted twice as fast as they did in the 1980s and '90s. ![]() "The actual imagery is freely available for download on the USGS website, and people can use it," says Josh Maurer, a doctoral student at Columbia University's Lamont-Doherty Earth Observatory. To look back in time, researchers are turning to a once-secret source: spy satellite imagery from the 1970s and 1980s, now declassified.
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