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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