I am not going to enter into a disucssion on this. You can go straight to Wikipedia and argue with these sources:
Rahmstorf, Stefan (2008). “Anthropogenic Climate Change: Revisiting the Facts”. In Zedillo, E. (PDF). Global Warming: Looking Beyond Kyoto. Brookings Institution Press. pp. 34–53.
“”Without any feedbacks, a doubling of CO2 (which amounts to a forcing of 3.7 W/m2) would result in 1°C global warming, which is easy to calculate and is undisputed. The remaining uncertainty is due entirely to feedbacks in the system, namely, the water vapor feedback, the ice-albedo feedback, the cloud feedback, and the lapse rate feedback”;[6] addition of these feedbacks leads to a value of approximately 3°C ± 1.5°C.”
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Comment on Two (+1) new uncertainty papers by Larry Goldberg
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