Hydrogen is an especially attractive transportation fuel. It is the least populating fuel available, and can be produced anywhere there is water and a clean source of electricity. A fuel cycle in which hydrogen is produced by solar-electrolysis of water, or by gasification of renewably grown...

Concern about global warming, poor urban air quality and dependence on insecure sources of oil are leading many nations to examine alternative energy sources and technologies for transportation and electricity generation. This analysis shows that most of the near-term fossil fuel-based...