If we want to get *really* scifi, maybe these hypothetical carbon capture machines could construct *themselves* out of captured carbon, possibly using some kind of tiny pod containing most of the materials needed to get started as well as the information to construct the entire machine... Maybe these pods could, themselves, be made through carbon capture using the same machines, making them self-replicating without any technical skills needed

But this is all some kind of absurd pipe dream, of course. It's not like self-replicating material-producing carbon capture machines grow on trees