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by scarmig 1734 days ago
Those are already accounted for in the 2.7C etc estimates, though. The CO2 forcing just accounts for 0.5C IIRC of the warming, with known positive feedbacks (most notably water vapor, but also albedo etc) driving the rest.

The question becomes, are unknown feedbacks more likely to be positive or negative? I'd lean toward negative, which is what most experts think, but definitely an unknown.