Study: Greenland's Ice Is Melting Faster Than Previously Thought

Some parts of the Greenland ice sheet are melting at rates up to five or six centimeters a day.

Scientists with the University of Cambridge say new research shows the ice sheet covering Greenland is melting rapidly at its base. 

The Greenland ice sheet is the second largest in the world, and some parts are losing five or six centimeters of ice a day.

It is already the biggest single contributor to global sea level rise.