translation.en: All the proof from America is that actually, if you pay people to recycle, if you give them a carrot rather than a stick, you can transform their behavior.
translation.zh: 美国的所有证据表明，事实上，如果你付钱让人民回收利用就可以做到。 如果你给他们的是胡萝卜而不是大棒， 你就能够改变他们的行为方式。