The technology is no longer theory we are seeing in action.
Many people look past the obstacles too easily, simply hoping for the prize at the end: clean, renewable, cost efficient energy.
Technology is coming along, but the storage of hydrogen is still very difficult.
Retaining enough fuel to provide a car with sufficient range would require that the tanks be under immense pressure (greater than can be obtained currently).
To increase that number, researchers have investigated liquid hydrogen storage.
The ability to maintain liquid hydrogen on a vehicle is still questionable however.
Since hydrogen cannot be harvested from the air, it has to be extracted from compounds on earth.
Methane extraction is currently the most common way to obtain hydrogen, but experts believe that electrolysis will prevail in the future.
Right now the process requires so much electricity, that it is not even practical to use on a large scale.
There is a hydrogen internal combustion engine and a hydrogen fuel cell powered vehicle.
Vehicles powered by fuel cells are still very far off.
Right now the first option is much more likely, however.
As soon as hydrogen can be produced and stored on a large scale, we will certainly see these types of vehicles on the road.
By weight, hydrogen fuel caries more energy than gasoline, so it is a logical move to raise awareness in hopes of using it some day.
It might be a ways off, but anything that can save us $$$ is ok by us.
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