Acidification is due to the water holding more carbon dioxide (carbonic acid) than baseline, right? This proposal is to turn carbonic acid into calcium carbonate, which 'removes' the carbonic acid from the water. So this would reduce acidification (at least until the water absorbs more carbon from the atmosphere). Am I missing something?
There is no magic get out of jail free card other than reducing carbon emissions to levels significantly below current, and then likely waiting thousands of year for some degree of stabilization. People talk of carbon sequestering but that needs to not just compensate for the current emissions, but the last 50-100 years of such - given no project is talking about volume sufficient for just what we’re still emitting I don’t hold out much hope.