Cars

[GracePringle]

How do cars that run on petrol differ from cars that run on Hydrogen? How are they better?

[bluedolphin]

They don't pollute....

[QPR]

Check out www.howstuffworks.com Great website that will explain it in depth.

[jaffacakes]

When hydrogen is burned, as is the case with the internal combustion engine in cars, it produces water. This is obviously much better for the environment. As ansteyg says, the infrastructure needs to be completely reorganised to allow easy refuelling, so it will be a while before these cars are mass produced.

[New Forester]

Hydrogen, like electricity, is very clean at the point of use. However, the energy has to come from somewhere. To make hydrogen takes electricity, which could be hydroelectric -- or coal, oil, nuclear etc. You could be making more (or worse) pollution elsewhere. There's no such thing as a free lunch. I was always amused years ago in Sussex to see a converted electric milk-float used by a local environmental action group. It was the only vehicle in the town which ran on nuclear energy...