垃圾当门票加拿大西北部的普罗维登斯堡市有关部门采用一种独特的方法来保持市区清洁。该部门在一处市民们常去休息的地方建造了一个现代化的游泳池，并规定，要进入池内游泳式洗澡，必须交一定数量的从市区街道上收集的垃圾。垃圾当门票... Garbage as Tickets Providence, North West Canada’s department uses a unique approach to keeping the city clean. The department built a modern swimming pool where citizens often go to rest and stipulated that a certain amount of rubbish collected from urban streets must be handed in for swimming in the pool. Trash as a ticket ...