Indeed, and the hybrids are not so much environmental-friendly : the production of a car pollutes usually more than the car itself when it is used, the batteries of hybrid cars will not help much. And as each factory does not pollute in the same way, some cars are actually cleaner than others (e.g. a car produced in a factory feeded by a coal power plant will "pollute" much more than a car produced in a factory feeded by natural gas power...)