[geoalchimista]

pH could drop to 7.95 by mid-century, according to the latest projections: https://bg.copernicus.org/articles/17/3439/2020/.

The second part of the sentence seems fictional. I don't think there is any support of that from a basic understanding of carbonate chemistry.

[miltondts]

Found something that could in fact trigger mass extinction due to acidification [0,1], however not on the stated timeline.

[0] - https://phys.org/news/2022-05-diatoms-threat-decline-due-oce...

[1] - https://www.nature.com/articles/s41467-022-31128-3