[pfdietz]

Soil too eventually reaches an equilibrium where carbon injection and carbon oxidation are in balance.

If what you thought was true, imagine a forest sitting there for millions of years. Where would this permanently sequestered carbon be going? Soils do not become unboundedly thick.

[circlefavshape]

hmmm ... but forests don't actually sit there for millions of years, right? and either way soils get eroded and ultimately end up on the ocean floor

https://ijw.org/wild-carbon-storage-in-old-forests/

[Geee]

Well, that's what oil and coal are. Oil is formed from marine biomass, and coal is formed from plants.

[pfdietz]

The rate at which these are formed over time is very very small. Almost all carbon fixed by photosynthesis is oxidized over a much shorter time scale.

[anticensor]

Coal no longer forms, oil is still forming but far slower than the rate consumed.