Interesting little piece from Reuters HERE, again suggesting that electric cars are not the answer to environmental problems caused by automobiles. And hydrogen cars are not either as you must factor in how the hydrogen itself was generated and of course its transportation to refueling stations. No - in modern urban societies we must look to options that are more efficient by design.
I have not verified this yet, but I recently heard on the radio that in order for a highway to carry the same capacity of people at the same speed into town as a regular commuter train line, it would need to be 60 lanes wide. Even if I misheard and it was only 20 we are talking many times if not orders of magnitude greater efficiency by rail than by car. It is simply that efficiency which makes it more friendly to the environment than the automobile.
Must try to look into that line a bit further. It is a compelling one.