Richard W. Miller imagines the future at the rate we’re going:
By the 2060s, if carbon-cycle feedbacks prove to be strong, the world could be 4°C warmer, and 40 to 70 percent of assessed species could be headed irreversibly toward extinction. And by the end of the century, my grandchildren and great grandchildren will live in a world where sea levels could be between three and seventeen feet higher than they are now. The abandonment of many of the world’s great cities will be well underway.
Map of the areas in direct danger of rising sea levels here.