Futher to my last, here are two more from the same directory:

http://www.physics.ohio-state.edu/~kagan/phy367/P367_articles/GreenHouseEffect/carbondioxide.html.

If you look closely you will see that compared to present trends it has been 100,000 years since the global temps were in this range.

One hundred thousand years ago the biosystem hadn't even stabilized. You're looking at a system that settled into a working range from -2.5deg C. to -10 deg C. for eighty thousand years and in the presence of a carbon graph that starts running away about 200 yrs ago, suddenly breaks out of that range.

So it strikes me your earlier references are plotted against such a long period as to obscure meaningful correlation.


A