Climate Change 2007: The Scientific Basis. Contribution of Working Group II to the Fourth Assessment Report of the IPCC: "The Physical Science Basis"
The Working Group I contribution to the IPCC Fourth Assessment Report describes progress in understanding of the human and natural drivers of climate change,1 observed climate change, climate processes and attribution, and estimates of projected future climate change. It builds upon past IPCC assessments and incorporates new fi ndings from the past six years of research. Scientifiic progress since the Third Assessment Report (TAR) is based upon large amounts of new and more comprehensive data, more sophisticated analyses of data, improvements in understanding of processes and their simulation in models and more extensive exploration of uncertainty ranges.