| − | The hydrogen economy is a term for a economic system in which [[hydrogen[[ is used to store [[energy]]. Burning [[hydrogen]], a chemical compound (H<sub>2</sub>) could be used in [[fuel cells]] to produce energy without [[carbon dioxide]] emissions. Instead, [[water]] would be produced. | + | The hydrogen economy is a term for a economic system in which [[hydrogen]] is used to store [[energy]]. Burning [[hydrogen]], a chemical compound (H<sub>2</sub>) could be used in [[fuel cells]] to produce energy without [[carbon dioxide]] emissions. Instead, [[water]] would be produced. |