On the electric side, I heard producing the NIMH batteries creates a ton of pollution. I doubt LiION or NICAD batteries are much better especially when you account for disposal. I've never heard what battery type is most viable for a 4 door sedan application. Does anyone know?

Not that we shouldn't do something to get off fossil fuels but I don't think we have any near term alternatives. Isn't the automobile still a small part (10%) of the overall US fossil fuel consumption?