[regularfry]

You're missing the trick. If you've got "free" energy, you can reverse the process: combine the CO2 with water and turn it back into high density hydrocarbon solids that you can safely bury. Or, if you can pick the hydrocarbon, use them in construction.

Doesn't help with the amount of gas you'd need to process, but the storage part is doable.

[EthanHeilman]

200,000 years later: nuhumans "wooah, I just discovered that there are all these hydrocarbons buried in the ground. These would just be perfect for this industrial revolution we are having"

[vladTheInhaler]

That would honestly be a huge upside to this approach. We've already extracted most of the easily accessible energy resources, so if our society fails, the next one will have a much harder time moving from agrarian to industrial.

[throwaway_pdp09]

Very good point, thanks.