What is the proportion of carbon in flux with vegetation compared to the percentage in other locations or generally flowing? [Alan]
The image depicts a carbon concentration in the atmosphere of 750 Gigatons (Note this is Carbon, not carbon dioxide) so it does not include other warming gases. Meanwhile vegetation plus soils and detritus store 2190 GT and oceans store some 40,000 GT of carbon. The flux (flow) between vegetation and atmosphere is identified as around 60 GT, between oceans and atmosphere around 90 GT while that from industry is 5.5 and land use change is about 1.6 GT. The message seems to be that the combined annual flow from land to atmosphere and oceans to atmosphere represents about 20% of the atmospheric content but only about 0.4% of the total carbon in land and ocean systems. Meanwhile, the exchange resulting from human activity is just about 5% of the total annual flux. We seem to be having a relatively small impact, but the longevity of the gases in the atmosphere results in its accumulation. (from the British Met Office https://www.e-education.psu.edu/earth530/sites/www.e-education.psu.edu.earth530/files/image/CDIAC_glob_c_cycle_700px.jpg). A search on carbon cycle and carbon flux images will reveal more sources.