Yes, it did indeed happen in the past. That's why we should be careful not to do it ourselves: https://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinction

Yes, it did indeed happen in the past. That's why we should be careful not to do it ourselves: https://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinction_event https://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extin...