Antarctic sea ice reaches a record low, a year after the previous one

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Antarctic summer minimum extent falls below the previous record set in February 2022, which had itself been the first below two million square kilometres in the satellite era. The significance is that until about 2016 Antarctic sea ice had shown no decline at all, and in some years a slight increase - the two hemispheres had been behaving differently, and then the southern record turned sharply. Whether that is a regime shift or extreme variability in a short record is genuinely unresolved.

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