Guardian: If the Intergovernmental Panel on Climate Change didn’t exist, would we need to invent it? Many people find it helpful to have a single point of reference on the big, global questions that everyone is interested in: can we detect human influence on climate, how large are changes expected to be in future, what are the main impacts likely to be and what can (not should) be done about it? These are questions on which the level of scientific consensus is far higher than most non-scientists …