clipped from: news.bbc.co.uk   

Climate change may bring "abrupt and irreversible" impacts, the UN's climate advisory panel is set to announce.

Among its top-line conclusions are that climate change is "unequivocal", that humankind's emissions of greenhouse gases are more than 90% likely to be the main cause, and that impacts can be reduced at reasonable cost.
IPCC PROJECTIONS
Probable temperature rise between 1.8C and 4C
Possible temperature rise between 1.1C and 6.4C
Sea level most likely to rise by 28-43cm
Arctic summer sea ice disappears in second half of century
Increase in heatwaves very likely
Increase in tropical storm intensity likely
Climate change: The evidence
The 20-page IPCC synthesis summary is due to be accompanied by a longer, more detailed document, and discussions on that are continuing here.
The summary will be officially launched by UN secretary-general Ban Ki-moon on Saturday.
Discussions were said to have been robust, with the US and other delegations keen to moderate language.