The United Nations-backed panel tasked with preparing regular scientific reports on the impact of climate change is to undergo an independent and comprehensive review. In 2007, the Nobel Peace Prize-winning Intergovernmental Panel on Climate Change (IPCC) issued its Fourth Assessment Report, which found the warming of the climate is outpacing natural variability, driven largely by human activity. But its credibility has come into question after revelations that the landmark publication contained some mistakes, including over the rate of Himalayan glacier melt. Although there were "a very small number of errors" in the 3,000-page Fourth Assessment Report, "I have seen no credible evidence that challenges the main conclusions" of the publication, Secretary-General Ban Ki-moon said. "Let me be clear: the threat posed by climate change is real," he said. "Nothing that has been alleged or revealed in the media recently alters the fundamental scientific consensus on climate change. Nor does it diminish the unique importance of the IPCC's work." In fact, Mr. Ban said, the science underpinning climate change continues to be strong, with evidence collected since 2007 showing that it is picking up pace. "The need for action is all the more urgent." To this end, he stressed the necessity of transparency, accuracy and objectivity, as well as the importance of curtailing the possibility of any errors in the future. IPCC Chairman Rajendra Pachauri acknowledged criticism of the Fourth Assessment Report, but he said that the publication's findings remain "robust" and that its "major conclusions of that report are really beyond any reasonable doubt". The IPCC is currently preparing to start work on the Fifth Assessment Report, scheduled to be finalised in 2014. The InterAcademy Council (IAC), a scientific organisation bringing together experts from around the world, has been tasked with reviewing the IPCC's processes and procedures to strengthen the quality of its reports. The review will be led by IAC co-chairs Robbert Dijkgraaf, who heads the Royal Netherlands Academy of Arts and Science, and Lu Yongxiang, President of the Chinese Academy of Sciences.