Sure, but the discussion was about energy and carbon footprint, not economics; I just reported what Elon Musk said the last presentation about how to produce th

Sure, but the discussion was about energy and carbon footprint, not economics; I just reported what Elon Musk said the last presentation about how to produce the fuel starting from carbon dioxide. Economic viability has to be proved, but I think they are more closer to it now than when they presented the BFR for the first time.