人类历史上的第一个“地球日”，是1970年4月22日，由美国哈佛大学法学院一个刚满25岁的学生——丹尼斯·海斯在校园发起和组织的。他因此被誉为“地球日之父”。

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The history of mankind's first "Earth Day", April 22, 1970, sponsored by the Law School of Harvard University American a just turned 25 years old students in the campus and the organization -- Dennis Hays. He was known as the "father of earth day".

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但实际上，“地球日”最早的发起人并不是他，而是美国一位政界名人盖洛德·尼尔森。1969年，美国民主党参议员盖洛德·尼尔森提议在全国各大学校园内举办环保问题讲演会。海斯听到这个建议后，就设想在剑桥市举办一次环保的演讲会。于是，他前往首都华盛顿会见尼尔森，谈了自己的设想。尼尔森立即表示愿意任用海斯，甚至鼓动他退学专心从事环保运动。于是，海斯毅然办理了停学手续。不久，他就把尼尔森的构想扩大，办起了一个在美国各地展开的大规模的社区性活动。1970年4月22日，美国举行了人类有史以来第一次规模宏大的群众性保护环境游行示威和演讲活动。全美2000多万人、1万所中小学、2000所高等院校和2000个社区以及各大团体参加了这次“地球日”活动。

But in fact, "Earth Day" the earliest promoters is not his, but USA a political celebrity Gaylord Nelson. In 1969, America Democratic Senator Gaylord Nelson proposed an environmental problem in the university campus lectures. Hayes heard this proposal, on the idea of holding a friendly talks in Cambridge city. So, he went to Washington to meet with Nelson, talked about his idea. Nelson immediately offered appointment Hayes, and even encouraged him to drop out of school to concentrate in the environmental movement. Thus, Hays decided to drop out processing procedures. Soon, he had the idea of expanding the Nelson, set up a America around in large-scale community activities. In April 22, 1970, American held in human history the first large-scale mass demonstrations and presentations Protect environment. The nation of about 20000000 people, 10000 primary and secondary schools, 2000 universities and 2000 community and various groups took part in the "Earth Day" activities.

“地球日”活动作为人类现代环保运动的开端，极大地推动了西方国家环境法规的建立。在“地球日”举办20周年的1990年，地球日活动从美国国内向世界范围扩展，成为第一个“国际地球日”。当年的4月22日，全世界有来自140多个国家的逾2亿人参与了“地球日”活动。从此，“世界地球日”成为全球性的环境保护运动。

"Earth Day" activities as the beginning of modern environmental movement, which greatly promoted the establishment of environmental regulations in the western countries. Held the 20 anniversary of the "Earth Day" in 1990, Earth Day activities extend from the domestic to the world American, became the first "world earth day". In April 22nd of that year, the world has more than 140 countries and more than 200000000 people participated in the "Earth Day" activities. Since then, the "World Earth Day" has become a worldwide environmental movement.