Actually the sea level has risen only about an inch or two in recorded sea level history.
Louisiana, however, has been recorded as sinking (perticularly New Orleans). What this is, was ignorant planning with an ever-increasing problem of a city below sea level. It's not as if the sea is encroaching on the city, if that was true it'd be the same as every city by the sea. It's the geology of that perticular area which was the problem.
If you dont believe me simply look up any information about it. The city of NO is actually BELOW the lake that surrounds it. The only reason it never flooded was the dikes, which were built to survive only very weak hurricanes.
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