You would think they could at least tell us by how much the Ph of the oceans has changed due to that excess absorption. I could not find a figure, my bet it is still between 6.9 and 7 and the impact of sulphuric acid from bottom of the ocean fissures are probably 10 times greater on the Ph of ocean than the carbon dioxide absorption. The reason is quite simple, most of the carbonates of metals (except the alkali) are quite insoluble, thus the constant stream of such metallic ions (from rivers) is met with carbonate ions which cause precipitation of the excess carbon dioxide. I think people are starting to see shadows everywhere, or better yet, too many scientists are inventing future catastrophes so they can get government grants to further study the calamities they are forecasting. Of course, if someone came and said, a single Mount Helen eruption has greater impact (on cooling the earth) than 50 years of our discharging carbon dioxide into the atmosphere. Furthermore, reforestation, and crops based ethanol fuels, could bring the carbon dioxide in excellent equilibrium.