Good chart, very useful...now I’m getting back to work...honest.
1) There 750 bt (billion tons of carbon) in the air
2) Combustion and factories are tossing 5.5 bt a year into the air, and sucking in none. For a net gain of 5.5 per year.
3) Plants et al are sucking in 61 and coughing up 60, for a net suction of 1. Presumably this excess builds up as plant matter in the short term, but presumably must be lost into the earth in the long term if such an excess continues (not shown on diagram though). So net loss of 1 bt per year.
4) Land use sucks in 1.5 and expels .5, for a net loss of 1 bt per year.
5) The oceans suck in 92 and expel 90, for a net loss of 2 bt per year.
Total change per year then is 5.5 bt - 1 - 1 - 2 = 1.5 bt
But, without man's interference we would get a net loss of 3 (-2 for ocean, -1 for plants etc).
So if we could somehow remove man's interference from the system, we would have atmospheric carbon declining at twice the rate that it is currently increasing.
Looks like a dynamic system with the large exchanges in the oceans and plants being more important then our contribution. The system seems to already want to lower the CO2, and will likely be even more insistent as CO2 continues to increase in the short term.
I am finding the information you provide very helpful in reinforcing my view that the global warming skeptics are right.