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Top scientists on how the world can stop using oil, gas and coal totally by 2050. But is nuclear the answer? Mark Jacobson, a professor of engineering at Stanford, and Malcolm Grimston of Imperial College discuss the practicalities. And Nathan Lewis, professor of chemistry at the California Institue of Technology, on the scale of the task. Plus, is wind power losing its puff? We report from Westmill Wind Farm near London.
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