Observations from over the past 130 years show that global mean sea level has been rising by an average of about 1.7 mm/year and by about 3 mm/year over the past 20 years. Projections of future global mean sea level essentially all agree that this rise will continue as climate " warms, mostly because of increasing ocean volume caused by the melting of glaciers and ice sheets, as well as the volume increase due to the thermal expansion of the global ocean.
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