"What I would like to draw your attention to is the level of CO2 levels, as preserved in prehistoric air bubbles, from very high quality ice core records from Antarctica. When researchers first looked at the results from these cores they observed a repeating correlation between CO2 and temperature through several glacial/interglacial cycles. However, when they began to look at higher resolution cycles they say something different. They observed that temperature would go up first, with CO2 coming up later. This correlation indicates that as one might expect as temperatures warm biological productivity increases resulting in more CO2 in the atmosphere. The lag between CO2 and rising or falling CO2 levels is something like 800 years.
I teach a general climate change course. To get the significance of this correlation over to the students I use the following analogy. I tell the students that based on these records if you believe that climate is being driven by CO2 then they probably would have no difficulty in accepting the idea that Winston Churchill was instrumental in the defeat of King Herold by Duke William of Orange at the Battle of Hastings in 1066. If you can believe that this historical temporal incongruity could be feasible then you can have no problem believing that CO2 is what's driving Earth's climate system.
In conclusion, the geologic record clearly shows us that there really is little correlation between CO2 levels and temperature. Although CO2 can have a minor influence on global temperature the effect is minimal and short lived as this cycle sits on top of the much larger water cycle, which is what truly controls global temperatures. The water cycle is in turn primarily influenced by natural celestial cycles and trends." [ This article especially rocks for the technically minded. It's chock full of data and charts. You really need to go read the whole thing now. -ed. ]
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