Daily Star: Many people ask how sure we are about the science of climate change. The most definitive examination of the scientific evidence is to be found in the work of the Intergovernmental Panel on Climate Change (IPCC) and its last major report published in 2007. I had the privilege of being chairman or co-chairman of the Panel’s scientific assessments from 1988 to 2002. Many hundreds of scientists from different countries were involved as contributors and reviewers for these reports, which …