Sustainable Energy Fund of Central Eastern Pennsylvania
- Invests in clean energy, renewable energy, and energy conservation. Provides information about the fund's investment policies, projects, and programs.
- http://www.thesef.org/

John Heinz National Wildlife Refuge at Tinicum
- Preserves Pennsylvania's largest freshwater tidal marsh.
- http://www.fws.gov/northeast/heinz/

Fall in PA - Foliage
- Learn about the changing of leaves in the Autumn, why it happens, and places to see the change; also includes web cams and photographs of various parts of the state.
- http://www.fallinpa.com/fallinpa/foliageReport.jsp

Great PA Cleanup
- An alliance of government, business, and community groups schedule events throughout the state where participants pick up trash along roads, rivers, and in parks.
- http://www.greatpacleanup.org/

EAC Network
- Helps establish and support environmental advisory councils. Provides resources and ideas to municipal councils.
- http://www.greentreks.org/eacnetwork/index.asp

Pennsylvania Forestry Association
- A broad-based citizens conservation group providing sound forest management advice and promoting wise stewardship of forest resources. Organization news and information.
- http://pfa.cas.psu.edu/

Pennsylvania Environmental Council
- Environmental education and advocacy, statewide. Discusses current issues and describes land use and water resources improvement projects around the state.
- http://www.pecpa.org/

Merrill W. Linn Land & Waterways Conservancy
- Seeks to protect and preserve ecological sites in Central Pennsylvania. Find photos, description of services and contact details.
- http://www.linnconservancy.org/

Pennsylvania Outdoor Lighting Council (POLC)
- Information on the state's latest lighting situation with photos, links, guidance on how to help with glare, light trespass and skyglow caused by light pollution. Includes information on creating local ordinances, and contacts.
- http://home.epix.net/~ghonis/

PA CleanWays
- A nonprofit organization that battles littering and illegal trash dumping through community cleanups, education, increased enforcement, and promoting specialty recycling programs. Information on projects, and beautification resources.
- http://www.pacleanways.org/

Conservation Officers of Pennsylvania Association
- COPA advocates sound scientific management of all wildlife and natural resources and provides networking and support to wildlife and waterway officials.
- http://www.pawco.org/

Knossus Project
- Pennsylvania-based research and development firm exploring the integration of technology, nature and humanity into everyday existence. Includes brief introduction and contacts.
- http://www.geniusloci.com/knossus.htm

Pennsylvania Department of Conservation and Natural Resources
- Profiles state environmental resources, policies, and programs.
- http://www.dcnr.state.pa.us/

Pennsylvania Forest Lands Beautification Program
- Removes illegally dumped trash in state forests and parks. Includes information on community involvement, volunteer opportunities, news, cleanups, illegal dump sites and recycling options.
- http://www.cleanpaforests.org/

PEN - The Pennsylvania Environmental Network
- Coalition of dozens of grassroots groups working to protect and inmprove the environment in Pennsylvania.
- http://www.penweb.org/index.html