You could be right - but what they don't realise is the nickel mined for the batteries in Canada, shipped to Sweden I believe to be processed for the batteries, then shipped to Japan to be built into the Prius (or wherever made) will use more CO2 than people that don't buy a new alleged green battery car, before it's even driven. Just a tad ironic. Hydrogen is the way forward.......... (here opens another can of worms)