Antarctica is likely to be the world's only habitable continent by the end of this century if global warming remains unchecked, the Government's chief scientist, Professor Sir David King, said last week.

He said the Earth was entering the "first hot period" for 60 million years, when there was no ice on the planet and "the rest of the globe could not sustain human life". The warning - one of the starkest delivered by a top scientist - comes as ministers decide next week whether to weaken measures to cut the pollution that causes climate change, even though Tony Blair last week described the situation as "very, very critical indeed".

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