By Clyde Spencer – Re-Blogged From http://www.WattsUpWithThat.com
Unless you have been in cryogenic suspended animation for several decades, you are aware of the extreme polarization about the role that CO2, particularly from burning fossil fuels, assertedly plays in warming the planet. I will attempt to provide a fresh perspective on the issue below.
It seems that many people think of global circulation models (GCMs) as being a virtual reality, or at least some kind of scientific ‘truth.’ What is generally unappreciated is that the GCMs are, instead, complex and convoluted working hypotheses. As such, they are a part of the Scientific Method. However, they should be subject to careful scrutiny, evaluated against reality, and modified as appropriate to conform to reality. That is the essence of the Scientific Method! Any hypothesis that does not have utility as an explanation, or have reliable predictive powers, does not achieve the purpose of scientific theories.