See also:

• Regional: North America: United States: North Carolina: Regions: Piedmont: Science and Environment  (9)
• Regional: North America: United States: North Carolina: Science and Environment  (40)

• Eno River Association - Non-profit organization devoted to protecting the Eno River from development and pollution. Calendar of events, wildflower photos, maps, and newsletters.
• RTI International - Conducts contract research in medicine, pharmaceuticals, public health, advanced technologies, environmental protection, and public policies.
• Triangle Clean Cities Coalition - A voluntary group of public and private entities working to increase the use of alternative fuel vehicles to improve air quality and reduce dependence on foreign oil.
• Triangle Greenways Council - Promotes and protects corridors of natural land in the area. Features trail maps, newsletter, meeting minutes, membership information. Based in Raleigh.
• Triangle Land Conservancy - Nonprofit corporation whose mission is to create a regional network of open space and natural areas in the six county Triangle region of North Carolina (Chatham, Durham, Johnston, Lee, Orange and Wake counties).