"Hydrogen is an energy carrier, not an energy source—hydrogen stores and delivers energy in a usable form, but it must be produced from hydrogen containing compounds." "Hydrogen can be produced using a variety of resources including biomass, hydro, wind, solar, geothermal, nuclear, coal with carbon sequestration, and natural gas. This diversity of sources makes hydrogen a promising energy carrier and enables hydrogen production almost anywhere in the world." (Quoted from paper)