The cuts the world will have to make in emissions of carbon dioxide are so huge it will have to find other ways to deal with the gas, a British scientist says.
He is Professor John Shepherd of the UK's Tyndall Centre for Climate Change Research, a leading scientific group.
Professor Shepherd says this will mean studying ways to store carbon and alter the Earth's albedo (its reflectivity).
He also believes nuclear power may be needed to fill the gap until cleaner sources can replace most fossil fuels.
Professor Shepherd was speaking at a seminar on emergency responses to climate change held by the Green College Centre for Environmental Policy and Understanding, Oxford.
While the historical record showed the climate had been fairly stable, he said, it had sometimes been highly and rapidly variable.
He said: "It's almost certain climate change won't be gradual, but will proceed by fits and starts and jerks and bumps."
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