It’s been a good month for climate-sceptics. Following the failure of the Copenhagen summit to deliver a global treaty, they have revelled in the discomfiture of the Intergovernmental Panel on Climate Change as it admitted it was wrong to say that the Himalayan glaciers could disappear by 2035. Critics have seized on this admission, using it to call the entire credibility of the IPCC and the science of climate change into question.
There is a lesson in this for those who think global warming is worth worrying about. And counter-intuitively perhaps, I would suggest that the lesson is not to try to prove global warming is a fact and simply show that it is a significant risk – because that should be cause enough for action.