The origin of the ice on Mercury is not yet known, but the two most likely sources are from outgassing of water from the planet's interior or deposition by impacts of comets. (newworldencyclopedia.org)
«CO2 lags temperature» CO2 causes temperature rise AND warming causes CO2 outgassing from oceans. (ourchangingclimate.wordpress.com)
bozza @ 354, even emissions at 10 % of current rates would be sufficient to keep on increaseing atmospheric CO2 concentrations, and ergo prevent net ocean outgassing of CO2. (skepticalscience.com)