There are companies looking into turning captured CO2 into a protein powder. Imagine this sort of technology at scale: you could clean up cities and help eliminate poverty at the same time.

Things are going to get worse before they get better. If I was a VC I’d be looking at investing in the clean up technology now so when it is needed people are willing to pay for it.

https://futurism.com/the-byte/solar-foods-alternative-protein-carbon-dioxide