I have been plotting this disparity since 2009 and it has been growing every year. The problem is that they are using the 1979 NAS report which stated that CO2 sensitivity was 3.0 degrees C +/- 1.5 degrees C for CO2 doubling and as the chart above shows the CO2 sensitivity is now considered to be closer to 1.0 degrees C per doubling. If you use the lower values then you are forced to consider other “natural” factors and if you do so you can build a model that works!