> 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

> 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.