However, since actual CO2 production is already below IPCC forecasts, we might take a more reasonable date of 2080-2100 for a doubling to 560. And, combining this with our derived sensitivity of 1C (rather than RealClimate's 3C) we will get 0.5C more warming in the next 75-100 years. This is about the magnitude of warming we experienced in the last century, and most of us did not even notice.