Past Observations

There have been several ocean acidification events in Earth's deep past, caused by massive input of carbon into the ocean, the best studied and most prominent of which occurred 55 Ma ago. The subsequent acidification led to the largest extinction of microscopic sea bed dwelling calcifiers [21]. In parts of the ocean, red clay instead of white carbonate was deposited for more than 100 000 a indicating the magnitude of the dissolution effect on global biogeochemical cycles and the duration of the recovery.

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