I'm 100% in favour of carbon removal through whatever sustainable means by which we can achieve it, but if we succeed, and carbon levels start to fall, I've got this nagging concern.

What happens in (say) 200 years, when our entire industrial base might be dependent on products created from atmospheric CO2? Is it possible that there won't be enough CO2 left for plants to grow? (I know there would be other very serious consequences as well, if atmospheric CO2 gets too low)

If there ends up being money in CO2 removal then how do we ensure CO2 levels remain in the habitable range, and that we don't just keep removing CO2 because doing so is valuable?

There appears to be a fundamental economic driver for climate change, which we are probably going to address using the very same economic driver that got us here in the first place.

(Admittedly, worrying about the world in 200 years seems a bit of a stretch at this moment in time).