Sierra Club“Since 1892, the Sierra Club has been working to protect communities, wild places, and the planet itself.” The Sierra Club describes itself as “the oldest, largest, and most influential grassroots environmental organization in the United States.” Sections of the site provide information on the club’s main goals: “Curbing Carbon,” “Move Beyond Coal,” “Clean Energy Solutions,” “Green Transportation,” “Resilient Habitats,” and “Safeguarding Communities.”