"Oh yeah? What about Antarctica? It's actually cooling!" has long been a standard response from the greenhouse-effect-is-a-myth crowd (whose members remain astonishingly numerous) when confronted with the facts.
It's a weak argument. Average temperatures are just that, and global warming is not necessarily inconsistent with instances of localized cooling. (It has, for instance, long been anticipated that warmer global temperatures would lead to the "shutdown" of the Gulf Stream, resulting in a colder western Europe, for instance.) However, a new report, which is being published in Nature, suggests that Antarctica may not be the exception they have so often made it out to be.
I don't think this will sway them much. Still, I hope we get past the nonsense and start seeing serious action on the issue soon.