With net zero policies under attack from elected far-right populists as well as autocratic petrostates, and another summer of record-breaking temperatures in Europe, the failure to decarbonise the world’s power supply is as gravely concerning as ever. But the UN secretary general, António Guterres, struck an optimistic note in a recent speech in New York. The world, he said, “is on the cusp of a new era … The sun is rising on a clean energy age.” Pointing to falls in the cost of onshore wind and solar, and the risk of further gas-price shocks in future, he called on big technology companies – whose datacentres are one reason for soaring energy use – to adopt a target of 100% low-carbon electricity by 2030.

Given US president Donald Trump’s personal hostility to renewable energy, Mr Guterres may be right that it makes more sense to demand action from US businesses at this point. In Scotland earlier this week, Mr Trump launched his latest misleading tirade, urging European leaders to “stop the windmills”.

His repeated attacks on........

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