The Sierra Club is a nonprofit organization dedicated to exploring, enjoying, and protecting the wild places of the Earth while promoting responsible use of ecosystems and resources. With an operating budget of $170.9 million and total revenue of $169 million for the 2024 filing year, the organization engages in educational initiatives and advocacy to enhance the quality of both natural and human environments. Notably, it does not rely on a single funder for 50% or more of its revenue.