There is a large amount of pollution cause by the manufacturing of cars, which can have a net benefit. Another benefit is that you could use very efficient car

There is a large amount of pollution cause by the manufacturing of cars, which can have a net benefit. Another benefit is that you could use very efficient cars for the trips that they are suited for like going shopping for groceries by yourself, and inefficient ones like picking up a new refrigerator. That said I'm also worried that it could increase the time spent in cars since there won't be as much negative feedback from stressful/boring/unproductive driving.