I heard a lecture about the possibility and limitations of space travel to Mars and one strong idea for surviving on the surface was to process the atmosphere (95% CO2) with hydrogen from earth to make methane and oxygen. (CO2 + 2xH2 --> CH4 + O2) How hard would it be to filter CO2 from the air here on Earth, provide methane for fuel and release O2 to curb or reduce global warming? Christian
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