On a recent trip to Calgary, Canada, I noticed that I was repeatedly being asked the same question every time I went shopping and it wasn't "paper or plastic." I was being asked, "Do you need a bag with that?" I wondered ... are Canadian cashiers better environmental stewards? And then I noticed on my receipts that for every "yes" answer, I was being charged five cents. It was enough to motivate a change in behavior: I began answering that question with a polite "no."