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Global sea level has risen by about 8 inches since 1901. This rise is due to a combination of melting ice and water expanding due to increased temperatures. While we don’t have precise measurements, scientific models indicate that melting ice has caused about two-thirds of sea level rise to date.
We estimate that 49,000 gigatonnes of ice have melted over that time frame—enough ice to cover the entire contiguous U.S. in an ice sheet 22 feet high (about 7 meters), or coat the entire Moon's surface in a 5-foot-high ice sheet.