E. What does the Current Observations Show?
A study of data between 1962 and 2012 support a lag in CO2 rise after an increase in temperature. [Humlum, O, Stordahl, K Solheim, J, (2012) The phase relation between atmospheric carbon dioxide and global temperature, Global and Planetary Change, Vol 100, pg. 51-69.] This study showed that the rise in sea temperature preceded the rise in CO2 concentration by about 11-12 months. It also plotted the fossil fuel emissions and found no influence on changes in atmospheric CO2.
Observations both historical and current fail to support the Greenhouse Effect Hypothesis based on CO2 and directly supports the opposite. This is the prime assumption and fundamental basis for all of the Assessment reports by the IPCC.