My first thought, as well. The cat toys and dog hair are piling up in the arctic condensers of our global refrigerator. I think the models don't have accurate proportional thermal radiation factors for radiation in vs out of the sol orbital plane. In other words, we don't weight polar radiation into empty space with enough amplification in the models, so polar atmosphere co2 doesn't get enough smothering amplification. Too many variables usually means something gets pruned from the tree so that programming branch doesn't break. Outliers get snatched up by the denier deer and carried off to Fox News country, never to be visited by science again.