Climate Central: The planets largest island is mostly covered in ice up to 2 miles deep. And what happens to that ice has major implications for sea level rise: Greenlands ice would raise sea levels up to 24 feet higher if it all melted. While the prospects of it all melting are extremely slim and certainly not for centuries and centuries warmer air and water temperatures have pushed enough ice to melt from Greenland each year to account for about 30 percent of recently observed sea level rise. Ice reaches...