When we emit fossil fuels, we release a lot of CO2. A significant amount of this CO2 is absorbed by the oceans. As the oceans absorb more CO2, a chemical reaction takes place, forming carbonic acid. This process is known as ocean acidification. This acidification is harmful to marine life, especially organisms that rely on calcium carbonate to build their shells and skeletons, such as corals, mollusks, and some types of plankton.
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