Abstract
The demand for energy has been expanding rapidly as it cannot be separated from the human life, which is upgrading continuously. The majority of the energy depends on the fossil fuel and the energy is used naturally as electricity, power, and heat in daily life. Japan is not rich in fossil resource, such as oil, but has made great efforts to develop the new energy and energy conservation technologies from the experience of energy crisis. As a result, Japan has become a country where the energy is used with highest efficiency in the world. However, it is clear that fossil fuel will dry up in the future, and further development of both new energy and energy conservation technologies is indispensable. The fuel cell has been paid much attention as a new energy technology, and active research and development have been advanced all over the world.
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