Declassified film helps scientists show that ice loss has doubled in the last 20 years.
Declassified film from Cold War spy satellites has revealed that Himalayan glaciers are retreating twice as fast now than they were 20 years ago. By comparing the historical footage with modern NASA data, researchers were able to show that between 1975 and 2000, the glaciers lost about 10 inches of ice each year. From 2000, the rate of loss increased to 20 inches per year.
The footage, from U.S. spy satellites and declassified in the mid-2000s, allowed scientists to digitally reconstruct the glacier surfaces."This was possible because multiple satellite images were taken from different angles," Maurer explained."Then, by taking the difference in elevation between the reconstructed historical glacier surfaces and the modern glacier surfaces, we calculated a change in ice volume for hundreds of individual glaciers.
However, he said the findings are important as the Himalayan glaciers contribute meltwater to the rivers that millions of people rely on. Changes to this water source could have a severe impact on the population.
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