Ice Age gives clues to global warming: study

Ice Age evidence confirms that a doubling of greenhouse gases could drive up world temperatures by about 3 Celsius (5.4 Fahrenheit), causing havoc with the climate, a study showed on Friday.

The researchers made a novel check of computer climate forecasts about the modern impact of heat-trapping gases, widely blamed on use of fossil fuels, against ice cores and marine sediments from the last Ice Age which ended 10,000 years ago.

"A doubling of carbon dioxide concentrations would cause a global temperature increase of around 3 Celsius," said Thomas Schneider of the Potsdam Institute for Climate Impact Research who led the report.

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