OK I could imagine that Nathan took the co2 data from here:


However since there was the mentioning of a "Keeling curve" it may be that he used this data

For a "global temperature update" the NOOA links to a co2now.org webpage which in the turn links to http://www.realclimate.org/index.php/data-sources/

In order to be able to reproduce the (in my point of view) mathematical oddities mentioned above it is clear that I would need to use the same dataset.