I think I'm more likely to walk to the store a mile or so away, though, whereas I'd drive if I had rented a car. Same thing for using the metro -- I've done it

I think I'm more likely to walk to the store a mile or so away, though, whereas I'd drive if I had rented a car. Same thing for using the metro -- I've done it several times, whereas I think I'd have driven if I'd rented a car. So I think it's an improvement, even environmentally.