Declassified US spy satellite images show 40 years of dramatic glacier ice loss in the Himalayan mountains. This region, often known as the world’s “third pole,” has the highest concentration of ice outside of the North and South Poles.

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Declassified US spy satellite images show 40 years of dramatic glacier ice loss in the Himalayan mountains. This region, often known as the world’s “third pole,” has the highest concentration of ice outside of the North and South Poles.