Damn shame they can't turn the ocean into beer first, then, if it's as bad as that. Shane would die happy.

I doubt that Japan or Hawaii or most other islands would be "submerged". They've got plenty of high mountains. But a lot of their valuable shorefront and lowlying areas would be inundated. The most vulnerable places, all things considered, are Bangladesh and Holland. In Bangladesh it would be a catastrophe almost beyond imagination. There is a huge population there, and they're living on a floodplain.