It doesn't address the issue myself, pwoke and R.L. are all pointing to. The Current atmospheric CO2 concentration is ~370ppm. Almost 100 ppm over the recent quiescent level. Most of the ~100 ppm change has occured in the last century, an unprescedented change compared to what is seen in the natural record. It just so happens to coincide with the boom of fossil fuel technology across the face of the earth.

That graph's "0" has a pre-industrial CO2 concentration. It's interesting but not relevant terribly to the large, short term changes humans are making to the atmosphere and possibly the climate.

I'm really sick of debating this. It's one I hope I loose.......