Its happening right now. The currents change. The lands flood. Divers are finding cities under the ocean right now. Its getting worse and we can't stop it. What makes an ice age? We can't handle that one either. Enjoy it. Your childrens children are going to have a lot to deal with.
It might be a good idea to start rethinking our attitudes to asylum-seekers and migrant now, since the problem is going to get worse and worse with climate change and rising sea-levels. We need to stop thinking we have a right to the bit of land we happen to have been born on.
India and Bangladesh already have coastal areas that are flooded and the population has had to move inland, which is worsening the crowding in cities with all the attendant problems. There are coastal roads on the East Coast that are flooded out on a regular basis, and some pricey property that is now really water front. New Orleans will be gone, as will Florida, Charleston, Norfolk, VA, New York, Houston, and DC. Its pretty grim.
For those of us that live above 200' of sea level we'll have to build a wall to keep out the flooding coastal immigrants from invading us with their rapists and murderers and I'm sure some of them are nice people but do we really want to take that chance?
For Rent or Lease: Ocean front spare room in the Appalachian foothills. $20 million starting bid.
Extensive flooding as the eusraric level of the oceans rise as much as 30 ft or more(this number is actually low to what some estimates postulate). Most of the world's largest cities are built along coastlines. Most of these will be buried under 20-30 ft of water. The geographic outline of the continents will be chsnged significantly, becoming much smaller as land mass becomes flooded.