From: gay@sfu.ca   
      
   Peter Percival wrote:   
      
   > Hydrogen is often touted as an ideal fuel in as much as it can be   
   > cleanly burnt.  But what are the practical ways of producing it (from   
   > water, I would suppose, but from other raw materials maybe)?  I am   
   > aware of electrolysis, but that raises the question of how is the   
   > electricity to be generated cleanly?.   
      
   Burning hydrogen produces water and releases energy. So if you want to   
   make hydrogen from water, you have to reverse that and supply energy.   
   How to make that energy greenly is the problem.   
   Hydrogen is not really an energy source; it is potentially an energy   
   transfer medium, like electricity.   
      
      
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