The world earth day originated in the United States. In 1969, the democratic senator gaylord nelson proposed in colleges and universities across the United States environmental protection question papers, students at harvard law school was 25 years old, Dennis hayes, thus puts forward concrete thinking in the national large-scale community activities, supported by many young students. The study says the earth habitable 1.75 billion remaining time

On April 22, 1970, the United States for the first time held a huge "earth day" activity. It marked the emergence of the environmental movement, and prompted the government to take some measures to control environmental pollution.

As the beginning of modern environmental movement, "earth day" activities to promote the establishment of a number of national environmental laws and regulations. On April 22, 1990, more than 140 countries and regions all over the world and across the country held a variety of promotional events, theme is how to improve the global environment as a whole. On April 22, 2009, the 63th United Nations general assembly resolution will every year on April 22, is identified as the "world earth day.

The earth and its ecological system is the humanity, the human in the future and the future to be in the economic, social and environmental balance between three aspects of demand, must be in harmony with nature and earth. Earth day aims to arouse human love the earth, the consciousness of protecting their homes, promote the coordinated development of resources development and environmental protection, thus improving the overall environment of the earth. China since the 1990 s, held every year on April 22, earth day activities, and according to the situation to determine the activity theme.

The earth is the common home of human, but human activity has caused serious damage to the earth. Such as forests, lakes, wetlands of biological survival are disappearing at an alarming rate; Coal, oil, natural gas and other non-renewable energy because of excessive exploitation of dried up; Energy combustion emissions of greenhouse gas lead to global warming, the resulting problems such as the polar ice caps melt, rising sea levels threaten to human survival and development.

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世界地球日活动起源于美国。1969年，美国民主党参议员盖洛德·尼尔森提议在全美高校举办环保问题讲演会，时年25岁的哈佛大学法学院学生丹尼斯·海斯由此提出在全美展开大规模社区活动的具体构想，得到众多青年学生的支持。 研究称地球宜居时间还剩17.5亿年

1970年4月22日，美国首次举行了声势浩大的“地球日”活动。这标志着美国环保运动的崛起，同时促使美国政府采取了一些治理环境污染的措施。

作为人类现代环保运动的开端，“地球日”活动推动了多个国家环境法规的建立。1990年4月22日，全世界140多个国家和地区同时在各地举行了多种多样的宣传活动，主题是如何改善全球整体环境。2009年4月22日，第63届联合国大会通过决议将每年的4月22日被确定为“世界地球日”。

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地球及其生态系统是人类的家园，人类今后和未来要在经济、社会和环境三方面的需求之间实现平衡，必须与自然界和地球和谐共处。世界地球日的宗旨是唤起人类爱护地球、保护家园的意识，促进资源开发与环境保护的协调发展，进而改善地球的整体环境。中国从20世纪90年代起，每年4月22日都举办世界地球日活动，并根据当年的情况确定活动主题。

地球是人类的共同家园，但人类的活动却对地球造成了严重的破坏。生物赖以生存的森林、湖泊、湿地等正以惊人的速度消失;煤炭、石油、天然气等不可再生能源因过度开采而面临枯竭;能源燃烧排放的大量温室气体导致全球气候变暖，由此引发的极地冰盖融化、海平面上升等问题威胁到人类的生存发展。