XPost: sci.space.policy, sci.physics   
   From: invalid@invalid.com   
      
   On 10/11/2016 7:51 PM, Alain Fournier wrote:   
   > On Oct/11/2016 at 8:19 PM, Serigo wrote :   
   >> On 10/11/2016 6:10 PM, Jeff Findley wrote:   
   >>> In article , invalid@invalid.com says...   
   >   
   >>>   
   >>>> no food, no water, no air.   
   >>>   
   >>> There is a bit of water on Mars (e.g. polar regions)   
   >>   
   >> conjecture, not proven and so little, unusable.   
   >   
   > Well, let's say it is a very strong conjecture.   
      
   but very little of it.   
      
   >   
   >>> and again a CO2   
   >>> atmosphere.  Food could be grown.   
   >>   
   >> all moisture would leave the plant.   
   >> Not enough CO2 or atmosphereic pressure to support any plants.   
   >> Radiation will kill it off in a few years.   
   >   
   > You would do so in pressurized greenhouses. It can be done.   
   >   
      
     the greenhouse would be the equivelent of a large tank and the light   
   would be dim due to outside dust.   
      
   What atmosphere would you use ?   
      
   you take up N2, must have that for breathing anyway.   
      
      
   Plants cannot live on CO2 alone. They get their bulk from more solid   
   substances like water and organic matter. This organic matter comes from   
   decomposing plants and animals or from man made fertilizers.   
      
   Too high a concentration of CO2 causes a reduction of photosynthesis in   
   certain of plants. There is also evidence from the past of major damage   
   to a wide variety of plants species from a sudden rise in CO2 (See   
   illustrations below). Higher concentrations of CO2 also reduce the   
   nutritional quality of some staples, such as wheat.   
      
   >   
   > Alain Fournier   
   >   
      
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