If all ice on the planet melted, which it won’t, sea level would rise about 215 feet.
Which would turn most NYC skyscrapers into islands.
http://www.usatoday.com/weather/resources/askjack/2004-11-21-melting-polar-ice_x.htm
Would also do a dandy job on most of Florida. Large chunks of the rest of the country, too.
Yep...and when the earth was cooler, e.g. during the last few ice ages, the sea level was 300 to 400 feet lower.
Up, down, up, down...its no big deal really.
My cursory math does not add up with 10 minutes of search and computation, roughly 5.4million square miles of Antarctic ice average 1mile thick versus roughly 140 million square miles of ocean.