Pennsylvania Department of Conservation and Natural Resources - Profiles state environmental resources, policies, and programs. Knossus Project - Pennsylvania-based research and development firm exploring the integration of technology, nature and humanity into everyday existence. Includes brief introduction and contacts. 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. Merrill W. Linn Land & Waterways Conservancy - Seeks to protect and preserve ecological sites in Central Pennsylvania. Find photos, description of services and contact details. Pennsylvania Environmental Council - Environmental education and advocacy, statewide. Discusses current issues and describes land use and water resources improvement projects around the state. The Sustainable Energy Fund - Invests in clean energy, renewable energy, and energy conservation. Provides information about the fund's investment policies, projects, and programs. Keep Pennsyvania Beautiful - 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. 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. John Heinz National Wildlife Refuge at Tinicum - Preserves Pennsylvania's largest freshwater tidal marsh.