http://www.gci.org.uk/briefings/rising_risk.pdf asserts that the “airbourne fraction” of CO2 is coming up to 100%, having been 50%: The point of great concern here is that over the last couple few years 2003/4/5 the rate of increase has jumped to nearer 3 ppmv per annum. This gives a loading of the atmosphere by weight that is roughly equal to not half but all the emissions from fossil fuel burning.
As far as I can see this is wrong. In 2003/4 growth rates were 2+ ppmv and heading downwards.
But the main point of this post was to inquire if anyone knows where the 2005 data is hiding. I can only find up to the end of 2004 (http://cdiac.esd.ornl.gov/ftp/trends/co2/maunaloa.co2 via http://cdiac.esd.ornl.gov/trends/co2/sio-mlo.htm ).
[Update: two people have now pointed me to http://www.cmdl.noaa.gov/projects/src/web/trends/co2_mm_mlo.dat - thanks. Now to update the pic... -W]
[Update: OK, so the pic up to 2005 is: