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Climate change is all over the news, from the politics of the Copenhagen summit to the University of East Anglia (UEA) emails and the latest criticisms of the Intergovernmental Panel on Climate Change (IPCC). Climate sceptics and some parts of the press have seized on this as evidence that the whole edifice of climate science is crumbling, but this briefing sets out to explain that this could not be further from the truth. The main uncertainties over climate change are not about whether or not it is happening, but about how fast it is happening and how bad it will get.