As the end of COP27 nears, US energy secretary Jennifer Granholm talks to Anne McElvoy from the climate summit in Egypt. They discuss the impact the global energy crisis is having on Joe Biden’s green agenda, whether the hype around hydrogen will endure and if the president is willing to put aside a tussle with China for the sake of climate cooperation. Plus, Vijay Vaitheesawaran, The Economist’s global energy and climate innovation editor, measures the ambitions declared at COP27 against what is achievable.

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