Established in 1972, the Oklahoma Chapter of the Sierra Club has over 4,300 dues paying members in Oklahoma with monthly meetings in Norman (Red Earth Group), Oklahoma City (Cimarron Group) and Tulsa (Green Country Group). Through the efforts of numerous dedicated volunteers, the Oklahoma Chapter organizes frequent outdoor activities, social events, conservation activities, and educational outreach efforts aimed at furthering the mission of the Sierra Club. Over the years, the Oklahoma Chapter of the Sierra Club has successfully protected Oklahoma's wildlife, preserved its natural resources, and educated the public on many issues at the local, state, and federal level. Oklahoma City, Oklahoma

The mission of the Oklahoma Department of Environmental Quality is to enhance the quality of life in Oklahoma and protect the health of its citizens by protecting, preserving and restoring the water, land and air of the state, thus fostering a clean, attractive, healthy, prosperous and sustainable environment.