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Several environmental organizations, among them the National Resources Defense Council and the Environmental Defense Fund, specialize in bringing lawsuits. Other environmentalist groups, such as the National Wildlife Federation, World Wildlife Fund, Friends of the Earth, the Nature Conservancy, and the Wilderness Society, disseminate information, participate in public hearings, lobby, stage demonstrations, and purchase land for preservation. A smaller group, including Wildlife Conservation International and the Worldwide Fund for Nature, conduct research on endangered species and ecosystems. More radical organizations, such Greenpeace, Earth First!, and the Earth Liberation Front, have more directly opposed actions they regard as environmentally harmful. While Greenpeace is devoted to nonviolent confrontation, the underground Earth Liberation Front engages in the clandestine destruction of property, the release of caged or penned animals, and other acts of sabotage.
On an international level, concern for the environment was the subject of a UN conference in Stockholm in 1972, attended by 114 nations. Out of this meeting developed the United Nations Conference on Environment and Development (1992).
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