http://data.giss.nasa.gov/gistemp/graphs/Fig.D.txt
Look at the black dots and not the red line 5 year smoothing. Clearly the equation for positive radiative forcing of CO2 is broken (3.5 X ln (X1/X0)
I note your attempt to change the topic from your previous “numbnuts” claim. Also, please note that I trust Dr. Hansen about as far as I could throw him.