Seven Points in Response to Romm  1. Romm’s faith in model
results is not warranted, as noted in my previous post.  2.
Romm’s argument is that in recent years annual emissions have
been higher than assumed in the IPCC’s worst case (A1FI)
scenario, and that we are on track to get to 1,000 ppm in 2100.
However, instead of looking at emissions it might make more
sense to look at real measurements of atmospheric CO2
concentrations for two reasons. First, CO2 concentrations are
more directly related to the greenhouse effect. Second, using
measured atmospheric CO2 concentrations short circuits two
layers of modeling which themselves are major sources of
uncertainty, namely, estimating global emissions and, then,
estimating the atmospheric CO2 concentrations (based on complex
models of the global carbon cycle).  3. What do recent CO2
measurements tell us? If we assume that CO2 concentration (not
emissions) will grow (compounded) from 2007 to 2100 at the same
annual rate as it did between 2000 and 2007, then CO2 will