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Page last updated at 09:05 GMT, Tuesday, 30 March 2010 10:05 UK

'We've pulled a trigger'

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Professor James Lovelock, the man who developed the Gaia theory which says the Earth functions as a kind of giant, self-regulating organism, has said that humanity should not feel guilty for global warming.

Speaking to Today presenter John Humphrys, he said that the human race was like a walker who found a gun in a forest and pulled the trigger, not knowing what it would do.

"We're not really guilty," he says. "We didn't deliberately set out to heat the world."

"But as a result of what we've done, to build our civilization, we've set things in motion."

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