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How is the sea level increasing?
One of the major effects of global warming is the rising sea level. The rise is basically due to expansion of water due to increased temperature of water mass and addition of water from melting of ice associated to the lands. Any drastic changes in sea level i.e. rise or depletion keeps the potential to strongly affect the densely populated seashore. The picture below shows how the sea level changed in past.
A considerable increase in mean sea level rise in last decade (Source: NASA.GOV)
A recent study suggests that the melting of ice in Greenland will increase if earth's temperature rises by 3 °C more in next 20 years due to global warming. This may lead to rise of the sea level causing entire or partial submergence of the coastal cities. The most affected areas will be Indian Ocean's Maldives, Florida, Gulf Coast and Eastern coast of USA and some major impacts on the densely populated areas of Nile Delta and part of Bangladesh.
Sea Level in Florida:
In case of SE USA and particularly in Florida people more concerned about sea level rise than warming. Most of the long-term measurements indicate about 2 mm rise in sea level per year which can calculated as 8" rise in a year but most of the scientists think it could be more. To know more details, read the Report on Sea Level Rise (pdf).
The Past and Future of Rising Seas - NCAR/UCAR AetosNews
Climate Change in Coastal Areas in Florida: Sea Level Rise Estimation and Economic
Analysis to Year 2080 (pdf) - Florida State University