At least in perennially sensible Canada you can actually exchange air miles for environmental rewards, from a donation to WWF through to a folding solar panel or electric scooter.

• 至少在长期理智的加拿大，实际上你可以用航空里程换环保奖励，有来自世界自然基金会（WWF）的捐赠，如一台可折叠太阳能电板或者电动踏板车。