从19世纪初开始,美国人就开始反思:“经济发展得那么快,如果不把一些地区保护起来,将来可能就没有大自然只有城市了”。当时只是有一个“保护区”的概念,并不重视化学品和污染物的问题,也不重视人居环境。而环保的概念和意识是从上个世纪60年代初开始的,当时出版了美国第一本关 Americans have started to reflect since the early 19th century: “The economy has developed so fast that if nothing is done to protect some areas, there may not be any nature and only cities in the future.” At that time, there was only a concept of “protected area”, with no emphasis on the issue of chemicals and pollutants or on the living environment. The concept and awareness of environmental protection is from the early 1960s, when the first publication of the United States