[ActionPlankton]

What people normally call "CCS" is mostly a short-term hack to keep the coal mines running. If you're going to burn coal, then, yes, please do CCS, but pretty soon you need to stop burning coal. I also don't trust that CO2 will stay underground forever; that also makes it "short term".

That said, we do need direct air capture (DAC) to repair the damage and to provide an alternative source for CO2 and hydrocarbons.

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To this end, I kind-of like algae as a low-tech solar-powered method:

https://academic.oup.com/bioscience/article/60/9/722/238034

I feel you could do this in a moderate-sized backyard.

You wouldn't want to bury the biomass directly (say as biochar) because you wouldn't want to lose the NPK nutrients -- but the above article deals with that. It describes a couple methods to extract carbon while recycling the other nutrients. None seem too difficult.

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In a completely different direction, nuclear-powered Sabatier/Bosch/electrolysis is also interesting:

https://en.wikipedia.org/wiki/Electrochemical_reduction_of_c...

https://en.wikipedia.org/wiki/Sabatier_reaction#Internationa...

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Either way, you have to combine your DAC with... not mining fossil fuels out of the ground. You have to do both.

(Note: Carbon-neutral fuels (bio-, synthesized) are fine, e.g. for air travel. You just can't mine them from the earth. That's the one rule. Then the cost of recapturing CO2 has to be baked into everything else.)