Take the U.S. for example. Beginning in 1990, the States will add a surtax to imported products according to the number of pounds of CFCs used in the manufacturing process, which will increase steadily over time.
以美國來說，從九○年起，美國就以進口產品在製造過程中消耗氟氯碳化物的磅數為準，課附加稅，且逐年調高。