National Geographic imagined new coastlines (and the cities that would go under) if all the ice melted, raising sea level by 216 feet.
There are more than five million cubic miles of ice on Earth, and some scientists say it would take more than 5,000 years to melt it all. If we continue adding carbon to the atmosphere, we'll very likely create an ice-free planet, with an average temperature of perhaps 80 degrees Fahrenheit instead of the current 58.
The light blue borders represent present day, and the land shows estimates. London, Venice, Bangladesh, and all of Florida would be submerged, and Australia would gain a new inland sea. Of course, estimates assume not much else changes. [via kottke]