Here in Britain it's a bit different. We're a small island. If global warming happens and the sea levels rise, we'll likely lose all our coastal towns and cities, which is a lot of them. London flooded etc. Everyone will move inland. Nowhere is more than 70 miles from the coast - we're that small. So everyone not on the coast is going to have to deal with refugees.

We're all going to have to help - it won't be viable to treat it as "someone else's problem". Probably it'll happen over decades rather than overnight, though.

(I know a lot of Americans are sceptical about global warming, and I'm not meaning to start that debate; just treat it as another "what if" scenario that some of us think isn't totally outlandish.)