[Names Ash Housewares]

Vostok ice core data.

Just do a google search. There are tons of graphs for it.

[4FreeSpeach]

One of the problems is that these graphs do not reflect the current level of CO2 such as the following related graph does

http://www.clearlight.com/~mhieb/WVFossils/last_400k_yrs.html

or
http://en.wikipedia.org/wiki/Image:Carbon_Dioxide_400kyr-2.png