From: magsilva@icmc.usp.br   
      
   Henry Spencer wrote:   
      
   > In article <408DB76C.26A37C26@frontiernet.net>, Joann Evans   
    wrote:   
   >>   
   >>   Where's the oxygen to burn fuel? 'Air breathing' engines do make that   
   >>assumption, but it's not true on all worlds.   
   >   
   > There are fuels which will burn in CO2.   
      
   Now changing worlds, from Venus to Mars. Using such fuels would be feasible?   
   >From all plans to colonize Mars, I've never heard about using engines that   
   uses CO2 directly.   
      
      
      
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   Marco Aurélio Graciotto Silva   
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