Hydrogen can combine with oxygen to form water, releasing heat in the process. It can be produced by electrolising water, but since this requires more energy than is released by its combustion, hydrogen cannot be regarded as an energy source. It can however serve as a useful way of carrying energy from the generator to the point of use. Thus hydrogen could be produced by generating electricity by nuclear or renewable sources and then used to drive cars and trains, and possibly planes. Hydrogen is easily stored either as a gas or in solid metal hydroids, which can easily absorb up to a thousand times their volume. The whole process emits virtually no greenhouse gases. At present the technology has not been fully developed but if the difficulties can be overcome it could be a useful energy transporter in the future (Eikerling et al. 2007).

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