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Re:150 Meter SpaceX Starhopper Test [video] by MPSimmons on Wednesday August 28, 2019 @02:33AM (#20817407)
Methane is CH4. Carbon from Carbon Dioxide (CO2) and Hydrogen from Water (H2O).

Stoichiometrically, CO2 + (2)H2O -> CH4 + (2)O2

The process is performed via the Sabatier Reaction, which someone else linked to.

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