Climate modelers are presumed if not self-claimed climate specialists. As such, these climate modelers would be fully aware that the globe cooled from 1942 to 1975 as the atmospheric CO2 concentration increased during that same period. They would also be aware that from 1942 to 1975 global CO2 emissions increased from under 4 billion tonnes of CO2 per year in 1942 to over 20 billion tonnes of CO2 by 1975.
Most climate models as well as the AGW hypothesis itself rely on a radiative forcing parameter. (1) The radiative forcing parameter for CO2 is dF = 5.35 ln(C/Co) where dF is the radiative forcing in Watts per square meter, C is the concentration of atmospheric CO2, and Co is the reference CO2 concentration. Normally the value of Co is specified at the pre-industrial concentration of 280 ppmv.
The radiative forcing parameter indicates that increases in CO2 concentration will produce an increase in temperature. This did not happen over the entire period from 1942 to 1975. Another example, during the Jurassic period when life was very abundant, for a period lasting over 10 million years, CO2 concentration increased from about 1200 ppmv to over 2000 ppmv and during that same period average global temperature was stable, trendless at about 22 degrees C. Therefore the radiative forcing parameter is clearly not valid.
How is this not fraud?
(1) http://www.globalwarmingequation.info/eqn%20derivation.pdf
budbromley 
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