Injustice is easy to oppose after it has receded into the past, and there is no cost to imagining yourself as a hero long after the event. Everyone celebrates the suffragettes now, but at the time they were vilified as hateful spinsters and terrorists. McCarthyism is a pejorative political label on right and left alike now, but at his peak, more Americans approved of Senator Joseph McCarthy than frowned on his witch-hunt. Most people would like to believe they’d have stood up against the homophobia of 1980s Britain – yet, by 1987, only 11% of the British public believed same-sex relations to be “not wrong at all”.

Which takes us to climate activism. This year has seen a global onslaught against people agitating for more action to mitigate the worst effects of the climate crisis. Courts can issue stern judgments, but so can history, and you have to wonder its future verdict on how the persecution and silencing of those raising the alarm only escalated when the scientific evidence had become so cast-iron, and when extreme weather events hammered home the imminent danger facing the human species. Here in Britain, a government which is reneging on its climate commitments – not least by expanding oil and gas licences – is simultaneously introducing repressive legislation to silence those holding them to account.

After punitive sentences were handed down to climate activists, the UN’s rapporteur for........

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