It's shown to widespread in areas where there's a high amount of CO2 in the air, possibly near factories or any buildings that release emissions and have a significant carbon footprint.
Remember, ocean acidification is a large rise of the PH level in water, as it becomes more of an acid as opposed to a base. Carbon dioxide traps heat, and it's possible that the heat contributes to the acidification, as well. The fact that Co2 traps heat is the sole reason for global warming.
Hopefully this helped!
