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The US chief scientist has told the BBC that climate change is now a fact.
Professor John Marburger, who advises President Bush, said it is more than 90% certain that greenhouse gas emissions from mankind are to blame.
The Earth may become "unliveable" without cuts in CO2 output, he said, but labelled targets for curbing temperature rise as "arbitrary".
His comments come shortly before major meetings on climate change at the UN and the Washington White House.