Raise sea level 200 feet and pretty much everything is gone. Economies, governments, civilizations. Your lunar colony will be a handful of dessicated corpses as supplies fail to arrive. And that's just in the first 20 feet of sea level rise!
I'm sure California will still be "the place you oughta be" no matter how bad global warming might get. All those wonderful mountains and inland seas will turn it into a virtual Utopia! Just keep your forests raked.
