The only vaguely practical large scale carbon capture I've seen proposed is to convert plants into biochar which can then be buried [1]. Any "machine" based method just needs huge amounts of capital, manufacturing and energy to be done on a big enough scale.
It's attractive for a few reasons:
1. The actual carbon capture is pretty hands off
2. You can extract some (carbon negative) hydrocarbon fuel from the pyrolisis process to help pay for everything
3. The carbon you get is fairly stable as solid carbon - there's no worrying about CO2 gas escaping.
There's pretty much no way we could do this at a scale big enough to cancel out current emissions (I'd say maybe 10-20% would be feasible). But as a way of reducing CO2 once we've managed to stop burning as many fossil fuels, it's pretty attractive.
It's attractive for a few reasons:
1. The actual carbon capture is pretty hands off
2. You can extract some (carbon negative) hydrocarbon fuel from the pyrolisis process to help pay for everything
3. The carbon you get is fairly stable as solid carbon - there's no worrying about CO2 gas escaping.
There's pretty much no way we could do this at a scale big enough to cancel out current emissions (I'd say maybe 10-20% would be feasible). But as a way of reducing CO2 once we've managed to stop burning as many fossil fuels, it's pretty attractive.
[1] https://concretecuts.xyz/articles/biochar/