As others have pointed out in the comments, the implications of humans breathing carbon in the range of ~1000 ppm is minor. However, I am terrified of some rec

As others have pointed out in the comments, the implications of humans breathing carbon in the range of ~1000 ppm is minor. However, I am terrified of some recent science indicating that carbon levels ~1200 ppm may prevent marine stratus clouds from forming, which would result in an additional 8 degrees C of warming very quickly (on top of the ~4 degrees we already expect at that level of carbon). [0] In fact, there is evidence in the geological record that this terrifying increase in warming at not-that-high levels of carbon concentration is real, and has happened before. More terrifying, the estimated carbon ppm at that time was only 600.[1] I don't know what the error bars are on the caltech climate study; 1200 seems like maybe I won't be around for it but 600 I definitely will be. [0] https://www.caltech.edu/about/news/high-cosub2sub-levels-can-destabilize-marine-layer-clouds https://www.caltech.edu/about/news/high-cosub2sub-levels-can... [1]https://www.theatlantic.com/magazine/archive/2021/03/extreme-climate-change-history/617793/ https://www.theatlantic.com/magazine/archive/2021/03/extreme...