On the flip side, they are big contributors to the junk food industry, who are among the biggest polluters on the planet, along with cow or pig farmers. I don't think the role of food choices is given nearly enough time in the media when we talk about solutions for the environment. Sure, I drive a car that gets shitty gas mileage, but its a rare day when I eat a steak or a bag of Doritos. That's a point well taken about new vs. used cars. Remember the hilarity of '08 when they were pushing "cash for clunkers" as an "environmental" strategy?Teenagers of today are radically better for the environment than teenagers of 20 years ago, for example, for the simple reason that they drive a hell of a lot less to hang out (thanks to Facebook et. al.).