About 1.1 Degree Celsius Warming per Doubling of Atmospheric CO2

Using annual values, the increase in global temperaute from 1850 to 2011 was 0.783 °C (HadCRU3T) and the increase in CO2equivalent was from 289.0 to 464.1 ppm (GISS).

If all that increase was caused by CO2e this implies a sensitivity of:
Sensitivity = 0.783 * log(2) / log(464.1/289.0)
= 1.145 °C per doubling of CO2e.

This is close [to] the estimates of other climate realists.