That's the point, isn't it: all those things aren't exactly equal. You likely don't even really have to worry about selling your house now...worst case you loose equity and move someplace else. Personally traumatic & unpleasant, but not exactly the end of the world. Here in the US, I expect people in Miami and Boston and NYC to be partying right up until the point the water laps up against their front door, and then there will be a government program to move you to higher ground.

If you're in Bangladesh, where can you go, other than another country. And people will fight for that. They'll fight wars. With neighbors that have nuclear weapons. That will not end well for any of us.