Rising seas will have dramatic effects on regions with low topography like Florida. The dark blue areas are less than 5 meters (16 feet) above sea level. This means no more Gold Coast... No more Miami, no more South Beach, no more Palm Beach, no more Fort Lauderdale... the pricest, most beautiful beach front real estate in the world gone!
Twenty years ago there was a beach at the end of Worth Avenue in Palm Beach, Florida... it is all but washed away... nothing left but the retaining sea wall... Once the ice in Greenland has melted... Florida will look like this image. Millions of people displaced... seeking food, shelter... this could happen in a matter of months. Nobody is ready for this. Noone.
From NASA website
Image credit: Shuttle Radar Topography Mission