Because of the looming specter of the exhaustion of fossil fuel resources, Japan has vigorously conducted research and development on various kinds of new energies. Recently greater importance is being placed on the utilization of clean energies as an answer to global environmental problems. Hydrogen is an especially attractive energy source as it only forms water when combusted. Up tp now, almost all practical-use hydrogen has been produced ny fossil fuels. If hydrogen can be produced by renewable energies, energy use will truly become harmonized with the environment.

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