The data comes from long-lost ice cores obtained during a secret army mission during the Cold War. Grabbing ice cores for scientists to study served as a perfect cover for their real intention, burying nuclear missiles within Greenland's ice sheet, in a scheme known as Project Iceworm. Along with the ice, scientists grabbed 12 feet of sediment that sat beneath the ice sheet. "The ancient frozen soil from beneath Greenland's ice sheet warns of trouble ahead," Bierman and co-author Tammy Rittenour wrote in The Conversation. Essentially, in the coming centuries, climate change will cause the Greenland ice sheet to melt completely, the researchers said.

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Persons: Paul Bierman, Bierman's, Andrew Christ, Josh Brown, Bierman, Tammy Rittenour, Kasl, David Atwood, Emilio, It's Organizations: Service, University of Vermont, U.S . Army, Oceanic Locations: Greenland, Danish, U.S, Miami, Manhattan