A confident prediction from the man who first brought our warming planet to public attention some 35 years ago. Energy from solar and wind is now cheaper than traditional fossil fuels and is being rapidly adopted across the world. The exception is the US where the federal priority is planet-warming coal, oil and gas. But even in the US, local action, prompted in part by McKibben-backed organizations like Third Act and 350.org, is promoting innovative uses of solar power.

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