It was, in many respects, one of internet history’s more improbable chapters. A wood-panelled hall. A 165-year-old parliament. And a young female MP embarking on a searing speech on climate change before punctuating it with two unexpected words: “OK boomer”.

For the captioning staff at New Zealand parliament TV, Chlöe Swarbrick’s remark last week — aimed at a heckler some years her senior — proved unintelligible. “OK Berma,” ran the station’s subtitles, in an admirable stab at intergenerational translation.

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