While battery electric vehicles are stealing much of the low-emission driving limelight at the moment, hydrogen power is still being explored as a future fuel. And who would have thought it would look like weird gray sludge. Some believe that hydrogen is the better long term option for low-emission vehicles, as its very energy dense and can refuel a vehicle in minutes — much like a conventional gasoline car. However, it does come with some caveats. Hydrogen is very difficult to store, and infrastructure for fuel cell EVs is rarer than a nine-bob note. But some crazy scientists have been…

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