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Unfortunately we were unable to film an interview with Rajendra Pachauri, but you can listen to his Exchanges at the Frontier broadcast on the BBC's World Service website.

Rajendra Pachauri is the Chair of the Intergovernmental Panel on Climate Change. In conversation with AC Grayling he talked about the danger of global warming - for the planet, the economy and human health - and what can be done to tackle it.

This autumn Wellcome Collection joined forces with the BBC World Service to host some of the biggest names in world science. AC Grayling, Professor of Philosophy at Birkbeck College, University of London, discussed the social impacts of their discoveries and the frontiers of scientific knowledge.