Methane-oxygen propellant can be near carbon-neutral when using huge solar farms to produce it from CO2 and water in the surrounding air. No net increase in gre

Methane-oxygen propellant can be near carbon-neutral when using huge solar farms to produce it from CO2 and water in the surrounding air. No net increase in greenhouse gasses. However, the ingredients of this process would be redistributed to the upper atmosphere - the effects of this should be carefully studied.