Sally Poppe, right, demonstrates filling her car at the hydrogen fuel station on Oct. 21, 2014 at Hydrogen Frontier Inc. in Burbank, Calif., owned by her husband Dan Poppe, left. Automakers are turning to another new technology - hydrogen fuel cells that have zero emissions.
Sally Poppe, right, demonstrates filling her car at the hydrogen fuel station on Oct. 21, 2014 at Hydrogen Frontier Inc. in Burbank, Calif., owned by her husband Dan Poppe, left. Automakers are turning to another new technology - hydrogen fuel cells that have zero emissions. Anne Cusack TNS
Sally Poppe, right, demonstrates filling her car at the hydrogen fuel station on Oct. 21, 2014 at Hydrogen Frontier Inc. in Burbank, Calif., owned by her husband Dan Poppe, left. Automakers are turning to another new technology - hydrogen fuel cells that have zero emissions. Anne Cusack TNS