Ocean acidification may have crossed 'planetary boundary' five years ago

A team of planetary scientists, ecologists, and marine biologists affiliated with several institutions in the U.S. and one in the U.K., has found evidence suggesting that parts of the world's oceans have already passed what has come to be known as a planetary boundary.

source https://phys.org/news/2025-06-ocean-acidification-planetary-boundary-years.html