XPost: sci.geo.geology, alt.sci.planetary   
   From: dietz@dls.net   
      
   Gordon D. Pusch wrote:   
      
   > If Earth-life hadn't happened to accidentally stumble across the trick   
   > of spewing out the nasty toxic poison waste-product gas called "oxygen,"   
   > Earth's atmosphere would still have even _MORE_ CO2 in it than Mars's ---   
      
   Why?  Most of Earth's carbon is fixed in carbonates, not organic materials,   
   right?  The presence of large amounts of liquid water on Earth causes CO2 to   
   react more quickly with positive ions from weathered silicates.   
      
   	Paul   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)