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Is a tax on carbon dioxide emissions the solution to climate change? Presenter Andrew Walker hears IMF economist Ian Parry put the argument that he hopes will win out at the summit in Paris. Andrew also speaks to Patrick Graichen of German green energy thinktank Agora about his country鈥檚 experience with electricity from renewables such as wind and solar. And Lucy Kellaway of the Financial Times tackles the old mantra that we learn from our mistakes. She doesn鈥檛 think much of it.
(Picture: Hands holding lumps of coal; Credit: Jeff J Mitchell/Getty Images)