碳定价政策已开始在大约40个国家（包括世界最大排放国中国）实施，更有23个城市、州省和地区的政府正在制定碳价格。
Carbon pricing policies are already being implemented by some 40 national governments, including that of China, the world’s largest emitter, and 23 cities, states, and regions that are putting a price on carbon.