The worst-case scenarios on climate change envisaged by the UN two years ago are already being realised, say scientists at an international meeting.
In a statement in Copenhagen on their six key messages to political leaders, they say there is a increasing risk of abrupt or irreversible climate shifts.
Even modest temperature rises will affect millions of people, particularly in the developing world, they warn.
But, they say, most tools needed to cut carbon dioxide emissions already exist.
More than 2,500 researchers and economists attended this meeting designed to update the world on the state of climate research ahead of key political negotiations set for December this year.
New data was presented in Copenhagen on sea level rise, which indicated that the best estimates of the Intergovernmental Panel on Climate Change (IPCC) made two years ago were woefully out of date.
Scientists heard that waters could rise by over a metre across the world with huge impacts for hundreds of millions of people.
There was also new information on how the Amazon rainforest would cope with rising temperatures. A UK Meteorological Office study concluded there would be a 75% loss of tree cover if the world warmed by three degrees for a century.
The scientists hope that their conclusions will remove any excuses from the political process.
Dr Katherine Richardson, who chaired the scientific steering committee that organised the conference, said the research presented added new certainty to the IPCC reports.
“We’ve seen lots more data, we can see where we are, no new surprises, we have a problem.”
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