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He believes pollution in the northern hemisphere has actually helped reduce global warming by reflecting sunlight.

However "this 'global dimming' is transient and could disappear in a few days like the smoke that it is, leaving us fully exposed to the heat of the global greenhouse". "We are in a fool's climate, accidentally kept cool by smoke," he says.

Climate-change scientists have been warning about the rise in temperatures reaching a "tipping point" when carbon and methane locked up in the Amazon rainforest and Arctic ice would be released into the atmosphere as the climate becomes drier and warmer.

I think Jim's sort of going for the worst-case scenario. In terms of billions of dead, I don't know that anyone really knows what the cost of climate change is going to be in terms of lives.

He's thinking of the possibility of very sudden, rapid climate change.



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