11.   The best way to produce hydrogen is to electrolyze water.

12.   The hard part has always been producing the hydrogen.

13.   The lack of infrastructure has led automakers to consider using more common fuels, particularly methanol, to produce hydrogen through the use of an on-board reformer.

14.   Anaerobic bacteria, which produce sulfur hydrogen and live in sea depths worsen the problem.

15.   Hydrogen can be produced from natural gas aboard vehicles or pure hydrogen can be used, requiring development of a new supply infrastructure.

16.   The refueling stations they will work on will provide heat, hot water and electricity to a home while also producing hydrogen for a fuel cell vehicle.

17.   The technology employed a technique for producing hydrogen through water electrolysis that the CSIC research institute had spent years developing.