# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2021-09-04 11:15:50 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/1434112968497766403) In reply to: [@keefmoon](http://twitter.com/keefmoon/status/1434112966354407426) Balanced was reached in our case because a different type of life evolved the converted O2 back into CO2, allowing an equilibrum to be reached. That seems like a pretty unlikely event, without which, all life on the planet would have died.