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Is there any way to bring carbon from pool 1 into 2? Or we already fucked up and have to live with it now?
Yes, carbon sequestration is the term for it, but none of them are currently practical to do on a scale that would mitigate the effects of the fossil fuels we burn. Growing trees is an example of this, as they do lock up carbon in the process of growing, but they're kind of a risky prospect since if the tree dies and rots or is caught in a wildfire then it releases the carbon again. Another option is literally just sticking it back underground in mines or oil wells, but of course that takes a lot of energy to do and then whole point of burning fossil fuels is to get energy so this one is currently a bit self-defeating. They're things that might be helpful to do if we succeed in transitioning to clean energy and have an excess of it available
If we can get nuclear fusion to work, that would be the kind of things that would then make sense to do. I can only hope that we figure it out as soon as possible.
Absolutely. Or even just excess capacity of wind and solar, to be honest. Whatever works, so long as we don't need it to replace fossil fuels and it isn't itself making more CO2 to lock away the CO2