The most environmentally friendly thing you can do as a car owner is just keep the oldest car u have alive as long as possible. Cash for lunkers wasn’t about getting people in cleaner cars, it was about subsidizing companies so they could sell more while destroying perfectly good vehicles. This shredded the used car market and we are paying for it now. Literally. If you need to get a new car anyways, sure an ev or hybrid might be the way. But keeping a stinky old diesel running, while it may seem counterintuitive, is the cleaner thing to do. What we wmit driving pails in comparison to the production pollution associated with all these throw away cars.