Nature: Just over two years after winning the Nobel Peace Prize, the United Nations panel on climate change is undergoing a period of soul-searching. The Intergovernmental Panel on Climate Change (IPCC) has always been a target for climate-change sceptics. In recent weeks, however, criticism has mounted and the panel admitted to a glaring error in its last comprehensive report, released in 2007, which says that Himalayan glaciers are likely to melt completely by 2035 (see Nature 463, 276–277; …