To make carbon-neutral rocket fuel, synthesize methane from CO2[1] that is extracted from the air. Both SpaceX[2] and Blue Origin[3] are currently developing me

To make carbon-neutral rocket fuel, synthesize methane from CO2[1] that is extracted from the air. Both SpaceX[2] and Blue Origin[3] are currently developing methane-fueled rocket engines. [1] https://en.wikipedia.org/wiki/Sabatier_reaction https://en.wikipedia.org/wiki/Sabatier_reaction [2] https://en.wikipedia.org/wiki/Raptor_(rocket_engine_family) https://en.wikipedia.org/wiki/Raptor_(rocket_engine_family) [3] https://en.wikipedia.org/wiki/BE-4 https://en.wikipedia.org/wiki/BE-4