Given the unexplained decline in atmospheric carbon that began 33 million years ago with a uptick 25mya then back to decline, looks like that self-adusting mechanism theory needs some, well, adusting. Yeah, when there's more carbon in the atmosphere, there's more of it to interact with other elements. They noticed a pattern fitting this with silicate deposits. Basically a record of a chemical reaction, not some 21st Century version of the 1980s Gia Hypothesis, which posited that Earth is an actual living creature which, yes, regulates the atmosphere over time.
Despite Glowball Farting claims, we've actually been a lot COOLER than we should be compared to previous interglacials, when most of the ice covering Greenland was gone and much more of Florida was under a heckuva lot more water - 10-15 feet deep in some spots farther inland.
The atmosphere is also losing CO2 at a noticable rate - straight into space, observable with infra red camaras on satellites observing the Earth's rim at sunset. They estimate in a billion years, there will be no air left. And there ain't a dang thang these dolts who want to sequester CO2 way below ground in rocks (kinda like getting rid of oceans so we won't have rain floods in the Mississippi) can do to stop it.
