Ocean acidification is from human-driven increased levels of CO2 in the atmosphere, which is dissolving into the ocean.
The ocean’s average pH is now around 8.1, which is alkaline, but as the ocean continues to absorb more CO2, the pH decreases and the ocean becomes more acidic which prevents marine life from thriving.
pathways:
11.08.2022 / PewTrust.org / 8 Facts About Antarctic Krill Show Why They Need Greater Protection
21.07.2022 / Earth.org / The ‘Evil Twin’ of Global Warming: What is Ocean Acidification?