Steven
If the relationship between global mean temperature and CO2 concentration can not be determined from the observed values after removing from the global mean temperature components that are oscillating or cyclic, how are you going to determine it?
By the way, IPCC’s 0.2 deg C per decade warming includes a 0.12 deg C per decade warming due to ocean cycles and it is wrong => http://bit.ly/HRvReF
The current observed global warming rate is only 0.08 deg C per decade, which is less than IPCC’s estimate by a factor of 2.5. IPCC’s projection of for a warming from 2.4 to 6.4 deg C warming by the end of this century is baseless.