The City Commission and Mayor of South Miami recently passed a resolution calling for South Florida to split away from North Florida over climate change. They cite inaction from a more conservative North Florida as a key reason for splitting. Sea level rise will have drastic effects on Southern Florida as much of the coast line is very close to sea level with much topographic change over great distances. A good calculator for sea level rise can be found here.
It will be interesting to see how this develops and if South Florida is actually able to split or if the politics will be sorted out and they can do more on climate change adaptation.
Read more about the new South Florida here.