What a great idea! We could use these "nanorobots" to fix the carbon from carbon dioxide into something more reduced, like say, carbohydrates, using a series of activation energy reducing steps that rely on some kind of outside power - maybe even solar power. Then we could even store the reduced carbon so that we can oxidize it later if we need some energy. But we would have to protect our "nanorobots" from the elements, and give them a good environment for doing all of this work. Maybe since this would be a new "green" technology, we could call them green forms. Of course, that might be too simple.. what about in Greek, "chloroplasts." I like that better. I think you're really on to something!