What's the correlation between atmospheric CO2 and temperature?:
source: Letter to Dr. Rajendra Pachauri, Chairman Intergovernmental Panel on Climate Change (Apr. 14, 2008)
The letter was signed by Hans Schreuder (Analytical Chemist), Piers Corbyn (Astrophysicist), Dr Don Parkes (Ecology) and Svend Hendriksen (1988 Nobel Laureate), and also is here.
(via Doug Ross)