Using the most advanced Earth-observing laser instrument NASA has ever flown in space, scientists have made precise, detailed measurements of how the elevation of the Greenland ice sheet has changed over sixteen years. The net loss of ice from Greenland and Antarctica has been responsible for 14 millimeters (9/16 inch) of sea-level rise between 2003 and 2019. The study found that Greenland’s ice sheet lost an average of 200 gigatons of ice per year. One gigaton of ice is enough to cover New York’s Central Park in ice more than 300 meters (1,000 feet) thick, reaching higher than the Chrysler Building.