And the air quality around the plant ought to improve, too, Ford says, because the roof will trap dust, absorb carbon dioxide and release oxygen into the environment.

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This is a device that reacts hydrogen and oxygen together to release electrical energy.

ECONOMIST: Selling fuel cells

They are where glucose and oxygen react together to release energy.

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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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