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On 27 September 2013 the The Intergovernmental Panel on Climate Change (IPCC) published its highly anticipated summary for policymakers, in advance of its fifth assessment report that will be published in early 2014. This special espisode of the podcast, explores briefly the origins of the organisation that produced this landmark report and, in more detail, the difficult international negotiations that have used the IPCCs findings since its inception. This historical overview ends with the question whether we can learn anything from previous problems of atmospheric pollution, in this case the Great London Smog and the ozone hole, to tackle global warming. The podcast concludes with a brief interview of historical climatologist Dagomar Degroot and his response to the summary of the fifth assessment report from the perspective of climate history. Dagomar is a PhD Candidate in environmental history at York University in Toronto, Canada.

Music credits: Alice In the City by Doxent Zsigmond and Improvisation On Friday by Alex. Available from ccMixter. Forward by Northbound, available from Free Music Archive