And it isn't the first time lifeforms on Earth made their own planet less hospitable. See the Oxygen Catastrophe or the Azolla Fern Event.
replyOn that topic, I enjoyed this romp through geologic history using CO2 as the lens:
replyThe Story of CO2 Is the Story of Everything - https://www.penguin.co.uk/books/455255/the-story-of-co2-is-t...