I recently watched a documentary on the history of Australia.
60 to 65,000 years ago the first humans reached Australia by walking across land bridges that existed then.
Of course since then the sea levels have risen, yet humans managed to survive.
If the sea is rising or if Florida is sinking, humans will do what humans do best, adapt.
As did folks from Asia walk into North America then into central and South America? As in folks that walked from main Europe to the British isles? Before glow bull warming caused sea levels to rise due to Dino farts?
I have confidence that my children's generation will come up with a solution to climate change that doesn't require transferring hundreds of billions of dollars to African despots.