[excuse-me]

You could do it effectively if you could create some massive dendritic type structure with a huge surface area of flat panels to absorb CO2 directly from the atmosphere. Since the CO2 concentration is so low you would need vast areas of these CO2 farms and so you would have to put some effort into making them look artistically pleasant to avoid public opposition.

The construction costs would be incredible, the only solution would be some sort of von-Neumann type nano-machines that could manufacture copies of themselves and gradually 'seed' the system over a large landmass.

Liquid fuel would be easily tapped from the trunk of these structures - although persuading people to consume a high colorific value syrup type liquid produced by bacteria on their pancakes could be tricky (unless they were Canadian)

[reneherse]

I could forsee such a scheme working, if only the flat panel collectors could be replaced on an annual basis. A period of system dormancy may be required prior to panel redeployment...

[lifthearth]

Somebody already tried this but had issues monetizing after multiple governments nationalized it. From there it suffered the tragedy of the commons. I don't think something like this would work unless the rights could be secured.

[excuse-me]

And the support structures would need to have some sort of end of life reuse value aswell ?