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Honestly, while that's a good suggestion, I think it's only part of the answer: 1) Trees used to be a lot more abundant before fossil fuels were a big a thing,

Honestly, while that's a good suggestion, I think it's only part of the answer: 1) Trees used to be a lot more abundant before fossil fuels were a big a thing, but now people are using the land the trees would need for other things (e.g. farming, cities) that are unlikely to be displaced. 2) At some point organic carbon sinks will hit equilibrium as the organisms that compose them start to die and decompose.

EGreg 10y ago
Well the assumption is that we will develop alternative energy sources byt STILL eventually release all the fossil carbon. And then it won't matter if te carbon sinks hit equilibrium. I am actually surprised how for most of the planet's history there was an equilibrium, when the gases distribute so globally. How does the system adjust without collapses? I think there was once a great oxygenation event, which killed off most anaerobic life on the planet. But since then there's been equilibrium...