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Hydrogen fuel cells

The most usable and eco-friendly future fuel, hydrogen is seen by many as the long-term favourite. A chemical reaction creates electricity and emits only water, giving petrol-like range.

Fuel cells have been propelling cars since the sixties, but progress has been very slow to date.

Five hydrogen buses currently run in London and five fuel-cell black cabs will roll out for the Olympics. But there are only four filling stations in the UK.

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Fuel cells and the infrastructure they require are very costly, but the Government wants a pump network by 2014-15. A shift to renewables could provide the clean energy needed for power-hungry hydrogen production.

AA's view…“Not convinced this is the holy grail, as hydrogen production is energy-intensive. Not enough of the electricity used will come from renewable sources”

Chance of success: 50%

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