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Founded in 1892 by conservationist, explorer, and naturalist John Muir, the Sierra Club has become one of the most prominent environmental organizations in the United States with more than 700,000 members. It also has affiliations in Canada (Sierra Club of Canada, founded in 1963) and a Sierra Club Student Coalition (founded in 1991). The U.S. Sierra Club organization consists of a nationally run chapter, chapters in all 50 states, the District of Columbia, and Puerto Rico, as well as hundreds of local and regional groups.

The Sierra Club organizes two main programs: The first promotes the use of political action to protect wilderness areas and the natural environment; the second encourages and facilitates outdoor activities, such as hiking and camping. Since its creation in the late ...

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