Debate's shifting sands
With regard to your report, "UN dossier 'ends all climate change doubt'" (26 January), the forthcoming and widely-leaked first part of the Intergovernmental Panel on Climate Change's Fourth Assessment Report certainly doesn't end our doubts. The models have been tweaked to give a narrower range of projected temperature rise, but they are still models and they are still based on unproven assumptions.
Interestingly, the report tries to explain the lack of temperature rise over the last eight years (while levels continue to increase) by the effect of volcanic eruptions and air pollution. But there must surely come a time soon when the model makers have to admit that the more additional factors they have to add, the less their central hypothesis is valid. Then we can finally have a proper debate.