美国的环境保护工作起步较早,已有30年的经验。但美国的环境保护工作完全是在经济相对发达而环境遭受严重破坏和污染后才认识到的,走的是“先污染后治理的路子”。经过多年的努力,已经实现了环境状况的根本好转,环境质量明显提高。如:汽车的二氧化碳的排放量比70年代减 The United States started its environmental protection work with 30 years of experience. However, the environmental protection in the United States is completely realized only after the economy is relatively developed and the environment is severely damaged and polluted. What is going on is “the path leading to pollution control first”. After years of hard work, a fundamental improvement of the environmental conditions has been achieved and the quality of the environment has been significantly improved. Such as: the car’s carbon dioxide emissions less than the 70’s