Due to an increase in average global temperatures and related greenhouse effects, ice caps and mountain glaciers are melting more rapidly than in the past. The International Panel on Climate Change has estimated that the average sea level will rise from anywhere between .6 and 2 feet over the next 100 years.
According to satellites, the average rate of sea level rising is 3.3 +/- 0.4 mm per year from 1993 and 2009.
Sea levels rising is due to two main factors. Thermal expansion (as water warms up, it expands) and ice melting. In 2007, the IPCC (International Panel on Climate Change) projected that in the 21st century, sea levels will rise 18 – 59 cm (7.1 -23 in). These number also leave out some other factors, but most projections say 1 meter in the 21th century.
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