VOA慢速英语:美国车主或将为自己汽车的碳排放买单

initiative – n. plan or program that is intended to solve a problem

transit – n. the act of moving people or things from one place to another

greenhouse gas – n. a gas that traps heat in the atmosphere and contribute to climate change

unit – n. an amount of length, time, money, etc., that is used as a standard for counting or measuring

vest – n. a sleeveless piece of clothing with buttons down the front that is worn over a shirt