Wind of Change?

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Cheap wind and solar power could soon make the coal, oil and gas industries defunct. Manuela Saragosa takes an optimistic peek at a possible zero-carbon, hi-tech future. Author and futurist Ramez Naam explains how renewable tech just keeps getting cheaper and more abundant, and why it is all down to the profit motive, while Lauri Myllyvirta of Greenpeace expresses his surprise at how fast China is ditching fossil fuels. Plus, the BBC's Michelle Fleury reports from the coal mining country of West Virginia, where many former miners are angry, unemployed and planning to vote for Donald Trump. (Photo: Cerro de Hula wind farm in Honduras. Credit: Orlando Sierra/AFP/Getty Images)