Hybrid Cars - The Motive Power Behind The World's Salvation?

Hybrid cars, and indeed, all electric vehicles are playing a rôle in the salvation of the planet's eco-system. At least, in respect to the world supporting human life. However, hybrid cars will one day be replaced by vehicles that use no irreplaceable energy at at all, once the technology is there. It is likely that there will be at least two such power sources in the near future: electricity and hydrogen - but who knows what else will be available? Hybrid and electric cars are revolutioniz...