Not adding anything super major here, but to repeat the broadcast: this has such a broad danger to it, is a core driver of ocean acidification (along with the ambient CO2 the ocean sinks up), by reducing the oxygen carrying capacity of water.

> Ocean acidification has been called the "evil twin of global warming" and "the other CO2 problem". Increased ocean temperatures and oxygen loss act concurrently with ocean acidification and constitute the "deadly trio" of climate change pressures on the marine environment. The impacts of this will be most severe for coral reefs and other shelled marine organisms,as well as those populations that depend on the ecosystem services they provide.

https://en.wikipedia.org/wiki/Ocean_acidification