Abstract. Our approach to climate analysis places highest priority on data. Climate forcing (see the definition at the end of this communication) by GHGs is a good place to start, as it is the drive for global warming. GHG amounts are well-measured. Our calculated forcings are in close agreement² with those of IPCC and we also agree with IPCC that the uncertainty in absolute GHG forcing is about 10%.³ We show the 60-month (5-year) running-mean of GHG forcing change (Fig. 1) to smooth out short-term variability of sources and sinks of the gases. Thus, results for the last 2.5 years are shaded,…