
Every five to seven years, the UN's Intergovernmental Panel on Climate Change (IPCC) produces a detailed and influential report summarising the science of climate change. The accuracy of these documents came under scrutiny in early 2010, after two highly publicised errors were discovered in the 'Impacts, Adaptation and Vulnerability' part of the Fourth Assessment Report (AR4). One was the claim that Himalayan glaciers could disappear by 2035 – hundreds of years earlier than the accepted figure – and the other was an incorrect number for the percentage of land in the Netherlands that is below sea level. Both mistakes were acknowledged by the IPCC and corrected in statements and errata notes.
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http://www.guardian.co.uk/environment/2012/jun/06/ipcc-errors-climate-science?intcmp=122