[slashdev]

It would have to be worse than the previous volcanic extinction events, which were massive. It's not clear the Earth can even do that anymore.

[nicklecompte]

> It's not clear the Earth can even do that anymore.

This is a good point, but the event wouldn't need to be more volcanic so much as that volcanism would need to ignite more carbon-containing materials - naively I would expect there to me more "fuel" in the Earth than there was 300m years ago.

[slashdev]

That's also a good point