Scientists and politicians have welcomed the report.
"This further underlines both how urgent it is to reach global agreement on reducing greenhouse gas emissions and how important it is for us all to adapt to the climate change that is already under way," European Environment Commissioner Stavros Dimas told the Reuters news agency.
Farewell to a melting glacier
Briny future for Malta
"This is another wake up call for governments, industry and individuals. We now have a clearer indication of the potential impact of global warming, some of which is already inevitable," said Martin Rees, president of the Royal Society.
"The challenge is now to support those people living in the most vulnerable areas so that they are able to adapt and improve their ways of life."
The wording of the summary of the report, which will be sent to world leaders in time for a G8 summit of industrialised nations in June, was finally decided after scientists and government officials from more than 100 countries worked through the night.
Several delegations, including the US, Saudi Arabia, China and India, had asked for the final version to reflect less certainty than the draft.
It is the second in a series of IPCC reports coming out this year, together making up its fourth global climate assessment.
The first element, on the science of climate change, released in February, concluded it was at least 90% likely that human activities are principally responsible for the warming observed since 1950.
The third part, due in May, will focus on ways of curbing the rise in greenhouse gas concentrations and temperature.
A fourth report in November will sum up all the findings.
"This further underlines both how urgent it is to reach global agreement on reducing greenhouse gas emissions and how important it is for us all to adapt to the climate change that is already under way," European Environment Commissioner Stavros Dimas told the Reuters news agency.
Farewell to a melting glacier
Briny future for Malta
"This is another wake up call for governments, industry and individuals. We now have a clearer indication of the potential impact of global warming, some of which is already inevitable," said Martin Rees, president of the Royal Society.
"The challenge is now to support those people living in the most vulnerable areas so that they are able to adapt and improve their ways of life."
The wording of the summary of the report, which will be sent to world leaders in time for a G8 summit of industrialised nations in June, was finally decided after scientists and government officials from more than 100 countries worked through the night.
Several delegations, including the US, Saudi Arabia, China and India, had asked for the final version to reflect less certainty than the draft.
It is the second in a series of IPCC reports coming out this year, together making up its fourth global climate assessment.
The first element, on the science of climate change, released in February, concluded it was at least 90% likely that human activities are principally responsible for the warming observed since 1950.
The third part, due in May, will focus on ways of curbing the rise in greenhouse gas concentrations and temperature.
A fourth report in November will sum up all the findings.
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