He is one of the coordinating lead authors of the Intergovernmental Panel on Climate Change, which shared the 2007 Nobel Peace Prize with former US Vice President Al Gore.
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He was the Chairman of The International Scientific Steering Committee for Avoiding Dangerous Climate Change Symposium on Stabilisation of Greenhouse Gas Concentrations which took place at the invitation of the British Prime Minister Tony Blair in 2005.
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He was the head of the climate change unit at the Organisation for Economic Co-operation and Development (OECD) for three years.
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