Evidence exists that atmospheric co2 has increased over the last several decades due to human activities. how does increased co2 levels affect the ph of earth's waters?

Due to formation of carbonic acid, increased CO2 level will decrease the pH of earth waters.

Carbon dioxide could form carbonic acid when dissolved into water. Since it was acid, it will lower the pH of the water. The level of carbon dioxide in human body is regulated because of the same reason. Higher or lower pH will have a harmful effect on the organism that live in the water.

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explanation:

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the sphincter muscles at the end of the digestive tract is the anus.