You mean it wasn't evil humanity/SUV caused global warming?
I'm confused!
I saw a documentary on fossils they found in the US. Volcanoes. Animals nearby died from suffocation by the ash,
or the ash depth made it impossible to move to food and water so they starved.
Animals further away died from "black lung" (actual medical term is the longest word in English - volcanopneumothora...).
So, no, it wasn't humans or SUVs. But you already knew that.