Graph of antarctic sea ice anomalies, from 1979 to 2024. It varies in a jagged and highly irregular fashion, with vertical excursions as high as positive 2.5 million square kilometres, and as low as negative 2.5 million square kilometres, but from 1979 to late 2016, there is little to no trend. Then, in late 2016, there is a sharp step-change, a near-vertical drop of around 2.5 million square kilometres. Then the line resumes its prior highly jagged, seemingly trendless behavior, but about 1.5 million square kilometres lower than before.
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