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The '''hydrogen [[economy]]''' is a term for a economic system in which [[hydrogen]] is used to store [[energy]].  Burning compressed [[hydrogen]], a chemical compound (H<sub>2</sub>) could be used in [[fuel cell]]s to produce energy without [[carbon dioxide]] emissions.  Instead, [[water]] would be produced.  
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The '''hydrogen [[economy]]''' is a term for an economic system in which [[hydrogen]] is used to store [[energy]].  Burning compressed [[hydrogen]], a chemical compound (H<sub>2</sub>) could be used in [[fuel cell]]s to produce energy without [[carbon dioxide]] emissions.  Instead, [[water]] would be produced.  
    
Hydrogen, which is the most abundant of all elements, is found in stars and is a volatile gas on [[earth]].
 
Hydrogen, which is the most abundant of all elements, is found in stars and is a volatile gas on [[earth]].
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