Hydrogen can be produced from a variety of feedstocks. These
include fossil fuel resources as well as renewable resources (e.g.,
biomass, water) with input from renewable energy sources (e.g.,
sunlight, wind, wave, or hydropower). A variety of process
technologies can be used, including chemical, biological, electrolytic, photolytic, and thermochemical. Each technology offers
unique opportunities, benefits, and challenges, although each is in
a different stage of development. Several technologies are already
available in the marketplace for the industrial production of
hydrogen