BBC News reports on what have thought for quite some time now:
"The severity of global warming over the next century will be much worse than previously believed, a leading climate scientist has warned.
Professor Chris Field, an author of a 2007 landmark report on climate change, said future temperatures "will be beyond anything" predicted.
Prof Field said the Intergovernmental Panel on Climate Change (IPCC) report had underestimated the rate of change.
He said warming is likely to cause more environmental damage than forecast.
Speaking at the American Science conference in Chicago, Prof Field said fresh data showed greenhouse gas emissions between 2000 and 2007 increased far more rapidly than expected.
"We are basically looking now at a future climate that is beyond anything that we've considered seriously in climate policy," he said.
Prof Field said the 2007 report, which predicted temperature rises between 1.1C and 6.4C over the next century, seriously underestimated the scale of the problem.
He said the increases in carbon dioxide have been caused, principally, by the burning of coal for electric power in India and China."
"The severity of global warming over the next century will be much worse than previously believed, a leading climate scientist has warned.
Professor Chris Field, an author of a 2007 landmark report on climate change, said future temperatures "will be beyond anything" predicted.
Prof Field said the Intergovernmental Panel on Climate Change (IPCC) report had underestimated the rate of change.
He said warming is likely to cause more environmental damage than forecast.
Speaking at the American Science conference in Chicago, Prof Field said fresh data showed greenhouse gas emissions between 2000 and 2007 increased far more rapidly than expected.
"We are basically looking now at a future climate that is beyond anything that we've considered seriously in climate policy," he said.
Prof Field said the 2007 report, which predicted temperature rises between 1.1C and 6.4C over the next century, seriously underestimated the scale of the problem.
He said the increases in carbon dioxide have been caused, principally, by the burning of coal for electric power in India and China."
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