Greenland’s Ice Sheet Holds Enough Ice to Reshape the World’s Coastlines The massive ice sheet covering Greenland is one of the most critical components of Earth’s climate system. Scientists estimate that if Greenland’s ice sheet were to melt completely, it would release enough frozen water to raise global sea levels by approximately 7 meters (about 23 feet)—a change that would dramatically alter coastlines worldwide. This isn’t a hypothetical number pulled from thin air. Greenland’s ice sheet c