[tmnvix]

I was under the impression that there have been multiple large extinction events in the past caused by excessive anaerobic decomposition underwater that led to the oceans becoming swamps and giving off nasty toxic gasses.

[parineum]

These plankton blooms happen naturally and are part of the biosphere already. There's a whole food chain that the guy breaks down in the podcast.

He was saying that this is usually kicked off by whale poop I think but because of the low numbers of whales, it happens way less now.