Answer: Because the Climate Models Have All Been Fudged

The Question, as asked (surprisingly) by a global warming believer:

One curious aspect of this result is that it
is also well known [Houghton et al., 2001] that the same models that
agree in simulating the anomaly in surface air temperature differ
significantly in their predicted climate sensitivity. The cited range
in climate sensitivity from a wide collection of models is usually 1.5
to 4.5 deg C for a doubling of CO2, where most global climate models
used for climate change studies vary by at least a factor of two in
equilibrium sensitivity.

The question is: if climate models differ by a factor of 2
to 3 in their climate sensitivity, how can they all simulate the global
temperature record with a reasonable degree of accuracy
. Kerr
[2007] and S. E. Schwartz et al. (Quantifying climate change"“too rosy a
picture?, available at, 2007)
recently pointed out the importance of understanding the answer to this
question. Indeed, Kerr [2007] referred to the present work and the
current paper provides the "˜"˜widely circulated analysis'' referred to
by Kerr [2007]. This report investigates the most probable explanation
for such an agreement. It uses published results from a wide variety of
model simulations to understand this apparent paradox between model
climate responses for the 20th century, but diverse climate model

Much more here at Climate Skeptic

One Comment

  1. Iideation:

    How do I submit my own blog?