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The hydrogen economy is a proposal for the distribution of energy by using hydrogen. Hydrogen (H2) gives off energy when it is combined with oxygen, but the hydrogen itself has to first be produced, which requires more energy than is released when it is used as a fuel.

To use hydrogen as a fuel, it first has to be generated by electrolysis of water or another method. A reduction in carbon dioxide emission would only be achieved if the energy used to spl...


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