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The Sierra Club is an environmental organization that combines an interest in recreation with political and legal activism. Founded in 1892 by John Muir as a small regional organization, the Sierra Club has grown into a national institution addressing a range of concerns. Pollution, environmental justice, and climate change have joined wildland preservation and outdoor recreation among its priorities, making the Sierra Club a major player in the environmental movement.

The Sierra Club's early activities included lobbying Congress to protect scenic areas like Yosemite Valley, Mount Rainier, and redwood forests and groves of sequoias, but the struggle that established its national reputation was a battle over a proposed reservoir in Hetch Hetchy Valley, California. Lasting from 1907 to 1913, the reservoir controversy galvanized the Sierra ...

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