close but slight correction.. sea-level rise in 15 years has gone from "cuckoo topic" to carefully monitored via centralized systems with leadership meetings. The best information that I can gather to date suggests that a) active port cities will deploy enough resources to roll with the changes, even if they are very expensive; b) large metropolitan areas generally will do the same, despite large costs; c) there is an unexpected threat to underground sewer and dry infrastructure, due to rising water tables; d) many places that do not have a lot of economics, really will go under water slowly.
Given the track record, a wager that there will be giant bailouts requested is almost a certain win, and that some portion of those bailouts will accompany graft-corruption under the covers. Lots of built infrastructure that was expensive to build in its' day, but not crucial now, will be lost to water.