Noun
(climate change) The increase in acidity of oceanic waters, from increased atmospheric carbon dioxide levels that increase dissolved carbon dioxide in seawater, which causes increased carbonic acid in ocean waters, lowering its pH level.
Used other than figuratively or idiomatically: see ocean, acidification.
Source: en.wiktionary.orgOcean acidification and the rise in sea temperature are threatening our coral reefs and fish supplies. Source: Internet