This happens in two times: you first buy your car, and then it’s up to you to decide how to use that. To make a car all sort of products must trave betwen distant factories, and the car itself must also usually travel a distance to get to you. Then, up to you. If your car is seldom used, a giant SUV can actually spend less than a hybrid… and this can also apply to cities. A pitty that a thing to be seldom used should have gargantuan proportions?