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Sixty people from thirty countries join Michael Sandel in a digital studio at Harvard to discuss the philosophical issues underlying the world's response to climate change.

The developed world has caused climate change, belting out greenhouse gases as it became rich (at least, most people think so). But the developing world - huge and growing economies like India and China - is increasingly a big part of the problem.

So who should pay to fix the mess? Is it fair to penalise the developing world as it strives to catch up? Is it acceptable that rich countries be allowed to buy credits, giving them permission to pollute? And is it time to re-think our material aspirations?

Audience producer: Louise Coletta
Producer: David Edmonds
Executive Producer: Richard Knight.