His graph would, too, if it weren't compressed to represent 300,000 years.
I do accept that for most of the Earth's history, increased CO2 has been a result of temperature increase rather than a cause. However, work last year by Jeremy Shakun (of Marcott and Shakun fame) showed that in many instances during the Holocene, increasing CO2 levels caused substantially MORE warming than the initial effect which triggered their own release. However, that was not the point.
During the 19th, 20th and 21st century, the correlation between CO2 level and global heat content has been exceptionally tight and through it all, CO2 levels have led.
The 300,000 year scale has nothing to do with any point I am trying to make. If you're interested, CO2 levels are now at values they have not reached in over 800,000 years.