There is a wild debate in the skeptic community on whether CO2 plays a role in climate changes over time and if so how much. I am going to avoid getting embroiled in that discussion because no one knows, including the IPCC, which starts with the basic assumption that it does, that we understand the forcing and proceeds from there. They back into the forcing in their models which are seriously flawed with very poor understanding of the clearly important factors of water in all its forms in our atmosphere and in the role of the sun and oceans. Even with seriously contaminated surface observation data, their models are failing miserably even just a decade or two into the runs.
There was a very similar divisive argument in the meteorological community in early to middle part the last century as Dr James Fleming of Colby College documented in the book “Historical Perspectives on Climate Change”. The pertinent chapter was on the web and can be found here
. This was before models and was based on theory as the write-up documents.
As a Synoptic Meteorologist and Climatologist over the years I have let the data do the talking. The data says that CO2 plays little or no role in climate change - which is cyclical and relates far better with the cycles in sun and ocean.
When correlating CO2 with temperature trends in various periods of cyclical warming and cooling the last 110 years we find a negative correlation from the late 1800s to 1917 (-0.35), positive from 1917 to 1940 (+0.43), negative during the WWII and post WWII boom from 1940 to around 1975 (-0.40), positive from 1975 to around 2000 (+0.36) and negative in the short period to 2009 (-0.56).
Click source to download PDF file to read FULL report from Joseph D’Aleo