I just recently read about this. Holland has a geological ground structure that keeps the water out, as long as the "walls" (dikes) are high enough. S Florida's ground is porous (limestone?), so putting up dikes won't help, as the sea level will rise from below. The first big problem is the rising sea levels getting in to the ground water aquifers, which S FL uses for it's drinking water, and then into a number of sites with buried toxic waste, which will start to mix with the groundwater and rising sea water.