XPost: sci.space.policy, sci.physics   
   From: jfindley@cinci.nospam.rr.com   
      
   In article <57fdbe2c$0$34569$c3e8da3$dbd57e7@news.astraweb.com>,   
   jfmezei.spamnot@vaxination.ca says...   
   >   
   > On 2016-10-11 19:10, Jeff Findley wrote:   
   >   
   > > False, Mars has a mostly CO2 atmosphere, albeit a very thin one.   
   >   
   > From a plant life point of view,  it si doubtful you could get plants to   
   > grow "outdoors". And if your plants are indoors, the CO2 they will get   
   > will come from humans, not outside air (since the indoor habitat will do   
   > everyuthing to keep that nasty CO2 out).   
      
   So it's not a problem to grow plants if you build a pressurized   
   greenhouse.  Pretty much everyone knows that.  It was even in book and   
   movie "The Maritain".   
      
   > The problem with Mars is that initial settlers will be dependent on   
   > Earth for ALL their supplies for a long time, and it will be even longer   
   > time before they start to have ability to manufacture goods locally from   
   > locally mined iron/aluminium/coal etc.   
      
   So, just like the base at the South Pole.  Note how long it's been   
   permanently staffed!   
      
   Jeff   
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