Where do you get that man is responsible for 3.4% of the .04% carbon in the atmosphere? I would love to have a source on that.
But in the spring and summer the deciduous vegetation in the northern hemisphere soaks it all back up. Meanwhile the ocean constantly absorbing on a net basis. The seasonal nature of the natural flux is apparent here:
[[Where do you get that man is responsible for 3.4% of the .04% carbon in the atmosphere?]]
I can’t remember now, but here’s some info I found quickly
“Anthropogenic (man-made) CO2 additions comprise (11,880 / 370,484) or 3.207% of all greenhouse gas concentrations, (ignoring water vapor).”
http://www.geocraft.com/WVFossils/greenhouse_data.html
Note, this site lists ALL of the greenhouse gases, which figure out differently, but is still only 0.117% produced by man- if we are talking just CO2 produced by man, the figure comes out to just 0.00137& of the atmosphere