Air Act) ，以及水源清净法 (Clean
Water Act) 。为什么地球日得到这么多支持呢？
We only have one earth, so we need to take care of her. That's what Senator Gaylord Nelson of Wisconsin believed. He was disturbed that an issue as important as our environment was not addressed in politics or by the media, so he created the first Earth Day, on April 22, 1970. An estimated 20 million people nationwide attended festivities that day. It was a truly astonishing grassroots explosion, leading eventually to national legislation such as the Clean Air Act and the Clean Water Act. Why did Earth Day receive so much support?