Dwindling stocks of fossil fuels and the looming threat of global warming have been pushing the world towards a new era of sustainable energy including wind, wave, solar and nuclear.

But with the discovery of techniques to extract shale gas, the narrative of the future of energy has changed.

Tony Juniper, freelance writer and green campaigner, and Lord Lawson, chairman and founder of Global Warming Policy Foundation, discuss if these new ways of extracting fuel have thrown a spanner into the works of green campaigners.

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