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.
世界地球日活動起源于美國。1969年，美國民主黨參議員蓋洛德·尼爾森提議在全美高校舉辦環保問題講演會，時年25歲的哈佛大學法學院學生丹尼斯·海斯由此提出在全美展開大規模社區活動的具體構想，得到眾多青年學生的支持。 研究稱地球宜居時間還剩17.5億年
1970年4月22日，美國首次舉行了聲勢浩大的“地球日”活動。這標志著美國環保運動的崛起，同時促使美國政府采取了一些治理環境污染的措施。
作為人類現代環保運動的開端，“地球日”活動推動了多個國家環境法規的建立。1990年4月22日，全世界140多個國家和地區同時在各地舉行了多種多樣的宣傳活動，主題是如何改善全球整體環境。2009年4月22日，第63屆聯合國大會通過決議將每年的4月22日被確定為“世界地球日”。
地球及其生態系統是人類的家園，人類今后和未來要在經濟、社會和環境三方面的需求之間實現平衡，必須與自然界和地球和諧共處。世界地球日的宗旨是喚起人類愛護地球、保護家園的意識，促進資源開發與環境保護的協調發展，進而改善地球的整體環境。中國從20世紀90年代起，每年4月22日都舉辦世界地球日活動，并根據當年的情況確定活動主題。
地球是人類的共同家園，但人類的活動卻對地球造成了嚴重的破壞。生物賴以生存的森林、湖泊、濕地等正以驚人的速度消失;煤炭、石油、天然氣等不可再生能源因過度開采而面臨枯竭;能源燃燒排放的大量溫室氣體導致全球氣候變暖，由此引發的極地冰蓋融化、海平面上升等問題威脅到人類的生存發展。
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