Dont confuse the issue with facts.
What they also forget is that if it warms up - but remains always below freezing - and the precipitation increases, the land ice will increase in depth.
Heck, you could have a significantly warming planet, causing a significantly increased precipitation at the south pole, causing a MUCH thicker ice sheet and see the oceans actually drop.
Add that to Siberia and even the Sahara and maybe we could reclaim the continental shelf!
:)