By Richard Black
Environment correspondent, BBC News website, Valencia
Climate change may bring "abrupt and irreversible" impacts, the UN's climate advisory panel is set to announce.
Delegates to the Intergovernmental Panel on Climate Change (IPCC) agreed a summary of its landmark report during overnight negotiations here.
Discussions were said to have been robust, with the US and other delegations keen to moderate language.
The summary will be officially launched by UN secretary-general Ban Ki-moon on Saturday.
It brings together elements of the three reports that the Nobel Prize-winning IPCC has already released this year, on the science of climate change, impacts and adaptation, and options for mitigating the problem.
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more:
http://news.bbc.co.uk/2/hi/science/nature/7098902.stm