I believe if you read the article, the decrease in Ph level in the ocean was was attributed to the increase in CO2 levels in the atmosphere. The oceans are acting as a buffering agent which is being depleted. The acid rain which use to be a big problem in the past, was due to the use of high sulfur coal use. Fortunately, we have made a lot of progress in this area. There is a lot of water and a lot of CO2, so I hope you can gather a lot of sea shells!
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