# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2021-09-04 11:15:50 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/1434112966354407426) In reply to: [@keefmoon](http://twitter.com/keefmoon/status/1434112964655828998) As life begins on a planet and develops, it will likely all be based on the same process, in this planet's case, the conversion of CO2 to O2. Any runaway process like that is going to eventually saturate the environment.