Legit question here, not snark. How could this possibly be better than something like an algae based biofuel? Have self-replicating, solar-powered machines do the CO2 extraction and reduction work on their highly specialized membranes. Then use the product? I get that this sounds fancy, but I'd be surprised if they can be even close to energy neutral pulling power from the grid to reduce the CO2 into hydrocarbons. At best, their plan just externalizes the carbon cost to the generator infrastructure (which could be renewable, sure, but again: plants are solar-powered as well).