On Thu, 1 Nov 2018 14:29:13 -0700 (PDT), Gary Harnagel
wrote:
The final numbers are 300.81 K and water vapor scale of 1.07. So
we have
a temperature rise of 1.11 K for a doubling of CO2 levels.

From empirical data we've had a temperature rise of close to one
degree compared to preindustrisl levels, despite that we haven't yet
had any doubling of CO2 levels but merely an increase of less than
50%. Therefore modtran must be underestimating the global warming.

Once again, don't trust a model blindly.