If the dust bowl is any indication, you'll have a period of time where people suffer followed by new technology and investment to address the problem long term.

If the dust bowl is any indication, you'll have a period of time where people suffer followed by new technology and investment to address the problem long term. As far as coastal flooding, many countries have already been dealing with this for a long time. Where worth it, technology can fix the issue, and where the value of the land and buildings aren't worth it, people will move.