Basic chemistry teaches that dissolving carbon dioxide in seawater will increase acidity. With atmospheric CO2 levels rising—touching 400 parts per million for the first time in millennia this past May—it is therefore a safe bet that the world's oceans are becoming more acidic. But just how much more? And how much do those levels change from place to place—at the coast or out in open waters, or at the surface versus in the depths?
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