[jammer5]

Extinctions don't necessarily have to be bound to one defined reason.

[alancalverd]

Spontaneous mass suicide of more than one species over an entire planet surely demands a planet-wide trigger. All we can determine from this graph is that CO2, O2 or their combined level or rate of change is unlikely to have been the cause or effect of more than one such event.

[jammer5]

I was thinking more on the line of disease, food, or natural disaster. CO2 might affect climate, and thus food, but that would be the end result of any combination of things, from asteroid hits, to massive volcanoes. The ice ages caused near extinction level events. I think all the extinction events have been detailed by science.

[chiralSPO]

Interesting that the mass extinctions apparently bear no correlation to CO2, O2, or any combination or derivative of the two.

It's almost as if they all (five of them) had different causes!

[Petrochemicals]

Interesting that the mass extinctions apparently bear no correlation to CO2, O2, or any combination or derivative of the two.

Exept the carboniferous?