The dream of hydrogen-powered cars emitting only water vapour is slipping further into the future as car companies grapple with some of the problems.
The latest estimate is that instead of the 10 years forecast by General Motors, buyers may have to wait 30 years.
GM has been leading the promotion of hydrogen as the natural solution to problems associated with petrol-powered cars - exhaust emissions and finite oil supplies.
Germany's BMW group is much more pessimistic, even though it recently started producing a hydrogen-powered 7 Series sedan with an internal combustion engine.
Read Article