From: ldo@nz.invalid   
      
   On Fri, 20 Feb 2026 16:53:53 -0500, William Hyde wrote:   
      
   > But getting the temperature up to the point that liquid water won't   
   > all condense in ice caps is also a difficult problem. The CO2 levels   
   > required are very toxic. We need a molecule which is strongly   
   > absorbing in the IR, chemically neutral, and which does not   
   > disassociate into something damaging in the upper atmosphere when   
   > struck by UV radiation.   
      
   Or alternatively, we need to reengineer the human species to be more   
   tolerant of unEarthly conditions. For example, did you know that we   
   have difficulty breathing in an oxygen concentration below about 15%?   
   (I suspect birds can do better than that.) That’s not that far below   
   normal Earth-atmospheric amount of 20%.   
      
   We would need to do such reengineering anyway, otherwise future space   
   pioneers are going to suffer greatly from prolonged exposure to   
   radiation and weightlessness.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)