> We're the first species to potentially cause a global extinction event There's evidence that cyanobacteria did it earlier, on an even more massive scale: ".

> We're the first species to potentially cause a global extinction event There's evidence that cyanobacteria did it earlier, on an even more massive scale: "...biologically induced molecular oxygen (dioxygen, O2) started to accumulate in Earth's atmosphere... causing almost all life on Earth to go extinct." [0] [0] https://en.wikipedia.org/wiki/Great_Oxidation_Event https://en.wikipedia.org/wiki/Great_Oxidation_Event