There's likely to be a new emphasis on technology to suck CO2 from the air in IPCC report on mitigation.
This new study will be the third of three important reports from the IPCC issued over the past eight months. The previous two have looked at the causes and impacts of climate change, but this one will focus on mitigation - or what we can do to stop it.
"We have a lot more material, this time on carbon dioxide removal. That is, not putting carbon into the atmosphere, but getting it out again," said Prof Jim Skea, from Imperial College, London. The use of these types of technology is controversial. Campaigners express doubts that they can be made to work economically and there are also concerns that technology could be seen as an excuse not to make the major changes in energy production that are needed.
"We have been running some informal meetings with governments to brief them ahead of the actual approval session," said Prof Skea.The new report, part of a regular review of the science dating back to 1990, will also have a new focus on the social aspects of cutting carbon.