The Intergovernmental Panel on Climate Change is coming up with its Fourth Assessment Report. IPCC's Working Group 1, assigned to provide the physical science basis, has adopted on 1 February 2007 and released the following day to the public the Summary for Policymakers version of their report. The report answers to the following questions: What progress has been made in understanding and attributing climate change? What do observations of the atmosphere, oceans, sea level, snow and ice tell us? How has climate been behaving in the last hundreds of thousand years? Which are the projections of future change? Conclusions indicated in the report are also relevant to air quality management stakeholders because evidence of aerosol and ozone linkage to climate change have been strengthened. The full Working Group I report will be available online from May 2007. It will be published by Cambridge University Press and is expected to be available in book form by late June 2007.

URL: http://ipcc-wg1.ucar.edu/wg1/docs/WG1AR4_SPM_Approved_05Feb.pdf