Instrumentation, Systems, and Automation Society: Philadelphia Section
- Includes local events, member directory, meeting and class schedules, and links to related sites.
- http://www.isa-philly.org/

Friends of Philadelphia Parks
- Dedicated to preserving and developing area parks through community outreach and volunteer work.
- http://www.democracyinaction.org/dia/organizations/ppall/content.jsp?content_KEY=828&t=new%20site%20temp.dwt

Philadelphia Botanical Club
- Scientific society presents its long history, meetings and field trips, herbarium, journal, and officers, with a membership form.
- http://www.acnatsci.org/hosted/botany_club/

GreenTreks
- Provides information about environmental issues through various media technologies.
- http://www.greentreks.org/

Friends of the Pennypack Park
- This park was established in 1905 to insure the protection of Pennypack Creek and the preservation of the surrounding land and historic structures.
- http://balford.com/fopp/

Morris Arboretum of the University of Pennsylvania
- Historic center providing research, teaching, and outreach programs to nurture the earth's forests, fields and landscapes
- http://www.business-services.upenn.edu/arboretum/

Ringing Rocks Foundation
- Works to research, document, and conserve diverse global wisdom traditions and their healing practices through photography, audio and video recordings, and preservation of artifacts. Includes a list of programs, partnerships, and publications.
- http://www.ringingrocks.org/

Friends of Fox Chase Farm
- Volunteer organization dedicated to preserving this historic farm by assisting with the physical maintenance, fund raising, guided tours and other public events.
- http://www.foxchasefarm.org/

Philadelphia Birdline
- Lists birds sighted in the area, and provides information on birdwatching opportunities.
- http://www.bcpl.net/~tross/phila.html

Wagner Free Institute of Science
- Education institution providing science classes for adult and school age children.
- http://www.wagnerfreeinstitute.org/

Welcome to SCRUB
- Non-profit organization designed to improve the environment and quality of life through education and legal and technical assistance.
- http://www.urbanblight.org/

Greensgrow Philadelphia Project
- Experimental urban farm designed as a prototype that can be replicated by others interested in urban agriculture.
- http://www.greensgrow.org/

10,000 Friends of Pennsylvania
- An alliance of organizations and individuals committed to promoting land use policies and actions that will enable Pennsylvania to strengthen its diverse urban, suburban, and rural communities and reduce sprawl.
- http://www.10000friends.org/

The Schuylkill Center for Environmental Education
- Provides nature programs, educational resources, and activities for adults and children.
- http://www.schuylkillcenter.org/

Health Sciences Libraries Consortium
- Non-profit organization facilitating information-sharing between its members.
- http://www.hslc.org/

City Parks Association
- Non-profit organization established to protect and maintain the quality of parks and open areas.
- http://www.cityparksphila.org/index.html

The Pennsylvania Horticultural Society
- Non-profit organization providing gardening information and shows.
- http://www.pennsylvaniahorticulturalsociety.org

Philadelphia Herpetological Society
- Organization that works to conserve endangered and threatened reptiles and amphibians.
- http://herpetology.com/phs.html

SWEP - Society of Women Environmental Professionals of Greater Philadelphia
- A non-profit professional association of women involved or interested in environmental law, science, business, and policy. Includes information on programs and services, members' directory, committees, and links.
- http://www.swepweb.com/