Got a few hundred mil lying around? We’re going to have to be making those kinds of decisions all around the country and around the globe in the next 50 years, and unless the carbon emitters pony up, it’s not at all clear where the money will come from. (I’m in the weird position of being an above-the-flood resident – perfectly dry, but when all the main roads and power and water and sewer lines are below water that matters only a little.)
(I think we’re also going to need big changes in building codes for floodable areas.)