America's oldest grassroots environmental organization addressing issue from clean water, forest conservation, overpopulation, human rights, sprawl, toxins, and wildland protection.
Sierra Club Outings
Offers hundreds of trips, outdoor adventures, and volunteer vacations for those interested in exploring, enjoying, and protecting the wild places of the Earth.
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.