When will buying gasoline cars seem weird? Twitter poll results

Petro-Canada gas station, Crossfields, Alberta, with electric-car charging stationIn honor of Earth Day last weekend, we re-ran our story about when citizens might see cars with tailpipes as morally wrong, somewhat like they do smoking or polluting factories today. This year, we decided to accompany it with a different question in our Twitter poll: When will buying gasoline cars seem weird, if not necessarily outright immoral?...