Antarctic sea ice was predicted to increase. Vague handwaving and claims of "It's obvious!" are not evidence for claims to the contrary.
_This_ is evidence.
S. Manabe, R. J. Stouffer, M. J. Spelman and K. Bryane
A 1991 paper. See p. 795 for the prediction.
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It is surprising, however, that the sea-ice thickness in the G integration increases significantly in the immediate vicinity of the Antarctic Continent despite the increase of atmospheric carbon dioxide.
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So, I have a 1991 paper by one of the big names at the time specifically predicting Antarctic sea ice growth.
Denialists have ... not a single thing saying the opposite. Westwall knew about that paper, but he's making his unsupported claim again. We went through this once before. He finally ended it by moving the goalposts and demanding 3 sources from me, even though he couldn't produce one. Each time he pulls that trick (demanding ever more sources without providing any of his own), I correctly take it as his admission of surrender.