section_path: History/Post-war expansion
section_name: Post-war expansion
paragraph_text: Post-war expansion
  
  In 1962, Silent Spring by American biologist Rachel Carson was published. The book cataloged the environmental impacts of the indiscriminate spraying of DDT in the US and questioned the logic of releasing large amounts of chemicals into the environment without fully understanding their effects on human health and ecology. The book suggested that DDT and other pesticides may cause cancer and that their agricultural use was a threat to wildlife, particularly birds. The resulting public concern led to the creation of the United States Environmental Protection Agency in 1970 which subsequently banned the agricultural use of DDT in the US in 1972. The limited use of DDT in disease vector control continues to this day in certain parts of the world and remains controversial. The book's legacy was to produce a far greater awareness of environmental issues and interest into how people affect the environment. With this new interest in environment came interest in problems such as air pollution and petroleum spills, and environmental interest grew. New pressure groups formed, notably Greenpeace and Friends of the Earth (US), as well as notable local organisations such as the Wyoming Outdoor Council, which was founded in 1967. From 1962 to 1998, the environmental movement founded 772 national organizations in the United States.
  
  In the 1970s, the environmental movement gained rapid speed around the world as a productive outgrowth of the counterculture movement.
  
  The world's first political parties to campaign on a predominantly environmental platform were the United Tasmania Group of Tasmania, Australia, and the Values Party of New Zealand. The first green party in Europe was the Popular Movement for the Environment, founded in 1972 in the Swiss canton of Neuchâtel. The first national green party in Europe was PEOPLE, founded in Britain in February 1973, which eventually turned into the Ecology Party, and then the Green Party.
  
  Protection of the environment also became important in the developing world; the Chipko movement was formed in India under the influence of Mhatmas Gandhi and they set up peaceful resistance to deforestation by literally hugging trees (leading to the term "tree huggers"). Their peaceful methods of protest and slogan "ecology is permanent economy" were very influential.
  
  Another milestone in the movement was the creation of Earth Day. Earth Day was first observed in San Francisco and other cities on 21 March 1970, the first day of spring. It was created to give awareness to environmental issues. On 21 March 1971, United Nations Secretary-General U Thant spoke of a spaceship Earth on Earth Day, hereby referring to the ecosystem services the earth supplies to us, and hence our obligation to protect it (and with it, ourselves). Earth Day is now coordinated globally by the Earth Day Network, and is celebrated in more than 192 countries every year.
  
  The UN's first major conference on international environmental issues, the United Nations Conference on the Human Environment (also known as the Stockholm Conference), was held on 5–16 June 1972. It marked a turning point in the development of international environmental politics.
  
  By the mid-1970s, many felt that people were on the edge of environmental catastrophe. The back-to-the-land movement started to form and ideas of environmental ethics joined with anti-Vietnam War sentiments and other political issues. These individuals lived outside normal society and started to take on some of the more radical environmental theories such as deep ecology. Around this time more mainstream environmentalism was starting to show force with the signing of the Endangered Species Act in 1973 and the formation of CITES in 1975. Significant amendments were also enacted to the United States Clean Air Act and Clean Water Act.
  
  In 1979, James Lovelock, a British scientist, published Gaia: A new look at life on Earth, which put forth the Gaia hypothesis; it proposes that life on earth can be understood as a single organism. This became an important part of the Deep Green ideology. Throughout the rest of the history of environmentalism there has been debate and argument between more radical followers of this Deep Green ideology and more mainstream environmentalists.