Thank you for your thoughtful response. Worth noting, we should expect changes in atmospheric CO2 with changes in global temperatures due to biosphere carbon cycle impacts and changing solubility of gases in sea water with changing temperature. Changes in atmospheric CO2 would certainly be expected as a consequence of, rather than cause of, changes in global temperatures. No doubt burning of fossil fuels is having an impact as well although considerable buffering may well be occurring, again due to carbon cycle equilibrium.