AGW Co2, pfft, page-72

must go now.  Ferro if you have time I have downloaded the C13 isotope data from the Scripps instritute for Mauna Loa

I cannot get it to match the global Co2 rate of change.   I suspect there may be something in their where you and many others assert that natural sinks are not in balance.  there are major changes happening all the time.

I also did a cumulative of the C13.  Could not get that to match Human Emissions either.  But I suspect I have not thought through yet if the format is correct.
The source is http://scrippsco2.ucsd.edu/data/mlo

Still working on it.  But you may have more luck with it.