From: rick.jones2@hp.com   
      
   psturroc@gmail.com wrote:   
   > Are there any rocket fuels -- existing or potential -- that are less   
   > polluting than kerosene or hydrogen?  If so, are any of them   
   > economically feasible?   
      
   I'm neither a rocket scientist nor chemist, but my understanding is   
   that the combustion product of Hydrogen and Oxygen (I'm ass-u-me-ing   
   the rockets are using Oxygen as the oxidizer) is water and I suspect   
   that is about as "non-polluting" as it gets.   
      
   Unless perhaps we start talking about things like rails and   
   "beanstalks" and the like, but then those aren't devices using "rocket   
   fuel" right?   
      
   rick jones   
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