You have made an error of logic. Identical effects do not have to have identical causes. If my drapes move at night, it could be becasue I left the window open and the wind is blowing them or it could be because my cat is walking behind them, or it could be a combination of those reasons (the wind blew the drapes and the cat decided it would make an interesting play toy). So too, Global Climate Models have all consistently shown a decline in year-to-year Arctic Sea ice to be one of the consequences of the 40% greater amount of CO2 that we have now versus the 1700′s. It could be the interglacial, it could be CO2, or it could be some combination thereof.
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