If Greenland's Ice Melts, Sea Levels Rise 23 Feet | Video

"And it's melting!" according to NASA. The deep ocean beneath Greenland is fueled by currents from the subtropics. This warm and salty water is melting the ice from the bottom up and much faster than the surface water. A new NASA project named Ocean Melting Glaciers (OMG) will be gathering more data on the ice melt over the next 5 years.

credit : NASA