The main reasons for rising sea levels are:
Ocean warming and the resultant thermal expansion of seawater.
Ice mass loss from glaciers, ice caps, and the Greenland and
Antarctic ice sheets
Reliable tide-gauge records indicate that sea level rose at a rate of about 1.7 millimeters per year during the 20th century. Recent satellite altimetry data, corrolates with recent tide gauge measurements, show that this rate is increasing, and sea level has risen at about 3 millimeters per year since 1993.
Many of the future predictions are based on emissions predictions as well. Between 2000 and 2100 we can predict that there will be a 500mm rise in sea levels.
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