PennFuture
Organization committed to conserving natural resources to develop prosperous a community. Site includes action alerts, environmental tips, donation and membership information, calendar of events, and legislative updates.

Coalition Against the Incinerator (CAI)
Works to close the dioxin-producing incinerator. Site includes meeting schedule, how you can help, photos of the incinerator, and information about its impact on health and the economy.

Appalachian Audubon Society
Includes action alerts, meeting and event schedule, newsletters, and photos and sound clips.

Pennsylvania Landscape and Nursery Association (PLNA)
Non-profit professional trade organization promoting the ornamental horticulture industry. Site includes membership benefits and application, directory of chapter, and a calendar of events.

Capital Area Greenbelt Association (CAGA)
Includes trail ranger articles, information about events such as the bike tour and Earth Day, newsletters, and a membership form.