The Sabatier reaction creates methane and water from CO2 and hydrogen: CO2 + 4H2 → CH4 + 2H2O NASA is investigating its use for harvesting water from exhaled

The Sabatier reaction creates methane and water from CO2 and hydrogen: CO2 + 4H2 → CH4 + 2H2O NASA is investigating its use for harvesting water from exhaled CO2 on the ISS, and it has been proposed as a way to make fuel on mars. [http://en.wikipedia.org/wiki/Sabatier_reaction http://en.wikipedia.org/wiki/Sabatier_reaction] Based on the way it's presented in the video, I'm guessing he may have found a way to catalyze this reaction in reverse using methane and water as fuel, and probably also reharvesting the leftover H2 in the process. (Granted, I have no clue if any of this is possible). This process must inevitably produce CO2, but the question is, does it produce significantly less of it than the current "generate power in one place and ship it around the country" system? If so, it must be heralded for what it is - an incremental improvement in energy efficiency; and companies will treat it as such, as it will be cheaper. But it's not an be-all, end-all solution to our problems.