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You are confusing warming from forcing with the predicted amplified feedback warming.
The warming from the forcing is done within a few hours, to at most a few months.
The amount of forcing warming the IPCC applies to doubling the CO2 level is 1.1 C,
and they do not define a latency for the forcing.
The long latency warming is for the predicted amplified feedbacks.
But lets run through it one more time.
CO2 forcing since 1940 5.35 X ln(406.53/311.3)=1.4278 X .3= .428C
CH4 forcing since 1940 .510 X ln(1.815/1.089)=..260 X .3= .078C
warming from TSI increase 1361.01-1360.87=.14 X .3= .042c
Total forcing since1940 .428 +.078 + .042 = .548 C
Total warming since 1940 .6704 C - known forcing .548 C = .1224 C
If you are saying that the warming from the increase in CO2 is incomplete,
then the number for CO2 forcing would increase, but it is pressing against the fixed observed
warming for the period observed since 1940, (.6704 C)
If the amount attributable to CO2 goes up, the amount of unknown goes down.
The only amount available for the amplified feedbacks is in that unknown quantity.
I am not confusing the two, you are failing to realize that this long latency you describe messes with your calculation. That "all unknowns" figure you came up with is missing another several decades of feedbacks because those feedbacks will alter the figure you started with. "total warming since 1940." That number would rise on a hypothetical planet whose forcings you froze today, right?
Your calculation is A - B = C. It doesn't matter how accurately you've placed B. Your A is wrong because feedbacks will push A higher, therefore your C is wrong.
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