With the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) still more than a year from completion in 2007, organizers are attempting to keep the process open and to respond to criticism of some of its contents, including uncertainty in climate models, that was received after release of the 2001 report.

Since 1990, the IPCC has produced three assessments of the scientific and socio-economic information relevant to understanding human-induced climate change, the potential impacts of climate change, and options for mitigation and adaptation. AR4 will contain an evaluation of the current understanding of climate change, based on peer-reviewed science that has been published or is in press by December 2005.