Map showing global temperature anomalies over the 5 years from 2006 to 2010. Dark red shows areas that were warmer than average and dark blue areas that were colder than average
The Intergovernmental Panel on Climate Change (IPCC) has published its fifth assessment report in 23 years (the last was in 2007). The IPCC is a small organisation, based in Geneva. Its reports, many thousands of pages in length, draw on the work of over 800 scientists and hundreds of peer-reviewed scientific papers. The 2013 assessment states that it is ‘virtually certain’ humans are to blame for ‘unequivocal’ global warming.
■ Atmospheric concentrations of the greenhouse gases (GHGs) carbon dioxide, methane and nitrous oxide are at levels ‘unprecedented in at least the last 800,000 years’.
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