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I see that Brandon Shollenberger has tried to explain the question regarding the validity of Lindzen’s claim (that the net impact since pre-industrial times of the increases of ALL GHG concentrations is roughly equal to that of a doubling of CO2 alone).
He apparently has also made a rough calculation (as I did) coming to essentially the same conclusion.
The conclusion stands: Lindzen was not precisely right, but close enough.
If you can provide data to show otherwise, please do so.
Otherwise, stop your snarky remarks – they make you look silly..
Max