With South Florida including Miami facing inundation due to global heating, the wiser property owners are starting to sell. Property values could collapse to near zero once the public realizes the land will cease to be land.

In effect, coastal land is a bubble, and the sooner these bubbles burst, the less harm they do.

It's more or less the same for coasts around the world, though the local rate of sea level rise varies. (It is faster in Florida because the land is sinking.) The inundation of ancient ports around the Mediterranean will be a terrible loss for all humanity, not just for the people who live in them.

I propose that the US government should buy out non-rich homeowners who bought before a certain cutoff date, but only up to a certain limit. That would save the poor from being wiped out, while not wasting money on wealthy people who don't face being wiped out, and avoid creating a "moral hazard" of encouraging people to buy properties at risk.

Those who bought their homes after the cut-off date could receive a buy-out reduced by 4% for each year between the cut-off date and when they purchased the property.

That would be the sensible thing to do, but I'd be surprised if it were done.