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Its complicated day to day but it’s not that complicated. We have a giant heat sink in the form of the arctic ocean. Once its ice free I expect freezing temperatures to be rare. There will be a point where this area(north west north america) no longer sees the 80 degree C swings in temperature that it has seen historically. Expectation is closing the temperature gap biased high.
You may have missed the point. Even if the haline circulation is over turned with fresh water, Europe will still trend warmer on a wider delta and different places will see an increase in seasonal delta but as it stands there will be a last winter for everywhere. Full stop. It is a time horizon question that remains.