The rising water level is mostly due to a combination of melt water from glaciers and ice sheets and thermal expansion of seawater as it warms. In 2021, global mean sea level was 97 millimeters (3.8 inches) above 1993 levels, making it the highest annual average in the satellite record (1993-present). Global mean sea level has risen about 8–9 inches (21–24 centimeters) since 1880. NOAA image based on analysis and data from Philip Thompson, University of Hawaii Sea Level Center. The values are shown as change in sea level in millimeters compared to the 1993-2008 average. Seasonal (3-month) sea level estimates from Church and White (2011) (light blue line) and University of Hawaii Fast Delivery sea level data (dark blue).
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