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Fuel cells which produce electricity from the combination of hydrogen and oxygen, would supplement other energy sources and release only water vapour into the environment.
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Fuel cells make hydrogen and oxygen react together to produce water and electricity in the reverse of the process that the Icelanders propose to use to make the hydrogen in the first place.
ECONOMIST: Clean living in Iceland
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The former uses coal, oxygen and steam to produce burnable hydrogen.
ECONOMIST: Carbon capture and storage