BBCnews is carrying this report on new discoveries about the date when Antarctica started to change from a temperate forested region to a frozen wasteland:

The gateway between the Atlantic and Pacific at the bottom of the globe opened up 41 million years ago, according to a study of old fish teeth.

The research in Science pushes back the date of the forging of Drake Passage to twice as long ago as once thought.

Kinda fun to think about what would happen if we undertook some sort of megaproject to close the thing back up and turn the continent back to forests again. It'd almost be worth it just to watch all the greenies's heads explode.