- Sierra Club
 - America's oldest grassroots environmental organisation addressing issue from clean water, forest conservation, overpopulation, human rights, sprawl, toxins, and wildland protection. - Sierra Club Environmental Education
- Encouraging youth to walk in Muir's footsteps. Offers a free John Muir Day Study Guide, which helps teachers teach about John Muir as an environmental role model.
- Sierra Club of Canada@
- Sierra Club Outings
- Offers hundreds of trips, outdoor adventures, and volunteer holidays for those interested in exploring, enjoying, and protecting the wild places of the Earth.
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