Rising sea levels




	Home > Learning Center > Rising sea levels Rising sea levels Rising sea levels have been a concern for a while now, but now there is evidence that it is happening faster than predicted. Evidence suggests that thermal expansion of sea water is the main contributor with melting ice caps a distant second (reportedly it would take millennia for the ice caps to melt all the way). Glacial melt would have to significantly increase to become the main factor. Scientists calculate and model that rising sea levels of just 20 cm could create 740,000 homeless people in Nigeria. Computer modeled maps also illustrate how a 1-meter (3 foot) rise would drown cities all along the eastern seaboard of the U.S. A 6-meter (20 foot) rise would cover most of Florida.
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	Rising sea levels and hotter water temperatures are also part of the oceans becoming more acidic and further threatening the marine biosphere. Evidence shows that the oceans have definitely become more acidic due to anthropogenic (human) causes but effects on the biosphere are as yet undocumented. Current rises in sea levels are observed using tide gauges.