“The geological record suggests that fossil fuel burning might have eliminated most life on Earth. … During the Permian mass extinction, the eruption of the Siberian Traps through the Tunguska basin seems to have produced between one and two gigatonnes of carbon dioxide a year. Today fossil fuel burning produces 30 gigatonnes a year.” (http://www.theguardian.com/commentisfree/2015/may/27/threat-islamic-state-fossil-fuel-burning)
Fossil fuel burning caused the mass extinction that created fossils? Actually, yes. Now, how do you feel about history repeating itself?