Professor Sir David King, the British government's chief scientist, warned that Antarctica could become the world's only habitable place by the year 2100. King said that the last time atmospheric carbon dioxide levels were as high as they are now was 60 million years ago, during a period of rapid global warming [3], when "no ice was left on Earth. Antarctica was the best place for mammals to live, and the rest of the world would not sustain human life." In America, a leaked NASA email [4] warned that "no one... is to do interviews or otherwise comment on" The Day After Tomorrow, a big-budget disaster movie depicting "an instant ice age." Last week, a NASA spokesperson "clarified" [5] that scientists are free to speak, but the agency has no "cooperation agreement" with the film's producers.