"Next time you don't want people to misunderstand, don't do this"

Sentence about C02 levels and ape-like creatures:Link to Carboniferous C02 levels that says diddly about C02 levels 12-20 mya. "

I mainly wanted to show the graph, but I've already shown this:

Quite a few times. So it was sort of a shorthand way of doing this, and thought maybe people were getting a bit tired of seeing this particular graphic.

Another reference for this is here:
http://www.pbs.org/wgbh/nova/ice/chill.html
Example:
Our climate today is actually a warm interval between these many periods of glaciation. The most recent period of glaciation, which many people think of as the "Ice Age", was at its height approximately 20,000 years ago.

Although the exact causes for ice ages, and the glacial cycles within them, have not been proven, they are most likely the result of a complicated dynamic interaction between such things as solar output, distance of the Earth from the sun, position and height of the continents, ocean circulation, and the composition of the atmosphere.

Also this:
"Possible Explanations for the Past 60 Million Years of Cooling

Climate change on ultra-long time scales (tens of millions of years) are more than likely connected to plate tectonics. Plate motions lead to cycles of ocean basin growth and destruction, known as Wilson cycles, involving continental rifting, seafloor-spreading, subduction, and collision. Several explanations of the latest cooling trend that involve a climate-tectonic connection are summarized below. "