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Today, global warming appears to be making the water in the north Atlantic less salty, due to extra freshwater from a melting Greenland ice sheet and more rainfall.

It's the world's largest island and 80% of it is covered by an ice sheet.

Camp Century, the Army’s nuclear-powered base, hummed inside the ice sheet.

It was the start of a grand plan that would have intermediate range tactical nuclear missiles moving back and forth through ice sheet tunnels.

Like an ice cube on a sultry summer day, Greenland’s ice sheet is melting, and that water, flowing into the ocean, is steadily raising sea level globally.