Wait, if Antartica is mainly ice, then much of it is just floating. Whether it melts or not is of no consequence. Drop an ice cube into your favorite drink and it has the same displacement as if it melts.
That’s what i’ve always thought.
But that makes sense though...
Most of the antarctic ice sheets are not floating in the water. As Fred Nerks has pointed out, Antarctica is a large land mass with the ice on top.