Yet another brainstorm idea, i.e. no clue whether it's plausible. When acid enters the groundwater, I would expect it to be partly neutralized by the subsoil and rock it percolates through, before emerging into streams and eventually the ocean. In the case of organic acids, the anion is eventually degraded, leaving an alkaline material. So altering agricultural processes or other land use to produce more acidity in groundwater might decrease ocean acidification.
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