Looking at all of history, it is apparent that climate sensitivity [to CO2] can not be significantly different from zero.
If you understand the relation between mathematics and the physical world, you understand that, for a forcing to have an effect, it must exist for a period of time and the effect of the forcing is calculated by its duration. If the forcing varies, (or not) the effect is determined by the time-integral of the forcing (or the time-integral of a function thereof).
The CO2 level has been above about 150 ppmv for at least the entire Phanerozoic eon (the last 542 million or so years). If CO2 was a forcing, its effect on average global temperature (AGT) would be calculated according to its time-integral (or the time-integral of a function thereof) for about 542 million years. Because there is no possible way for that calculation to consistently result in the current average global temperature, CO2 cannot be a forcing.
Variations of this proof and identification of what does cause climate change (R^2 > 0.97 (greater than 97% statistical significance)) are at http://agwunveiled.blogspot.com
Hi MS, thought this may be of interest.ReplyDelete