Critically for many shell-forming marine organisms, carbonate (CO3-2) is simultaneously consumed by reaction of the excess of hydrogen ions produced from the reaction above:
H+ + CO3- => HCO3-
Combining the two reactions, the net affect is approximately that one unit of carbonate ion is consumed for each unit of carbon dioxide added to seawater.
CO2 + H2O + CO3-2 ↔ 2HCO3-
Because the reactions run simultaneously, both pH and the availability of carbonate are reduced as the atmospheric concentration of carbon dioxide rises.
are we likelier to see the seas boil, or carbonate first?
Carbonate, boiling is our last concern because at that point the Earth would be transforming into Venis and it was already game over.
Venis
deleted by creator
sea levels rising due to glacial melt is good now
Phosphane gang rise up?
https://www.youtube.com/watch?v=km_MgRkHHF4
Easier to bottle and sell carbonated seawater than still-boiling seawater, so we know which one they'll choose.