Tabulate the CO2
exhalation rates over the
last 15,000 years from (i) terrestrial and submarine volcanism (including maars, gas vents, geysers and springs) and calc - silicate mineral formation, and (ii) CH4 oxidation to CO2 derived from CH4
exhalation by terrestrial and submarine volcanism, natural hydrocarbon leakage from sediments and sedimentary rocks, methane hydrates, soils, microbiological decay of plant material, arthropods, ruminants and terrestrial methanogenic bacteria to a depth of 4 km.