Friends of the Urban Forest
- http://www.fuf.net/
- Provides help to groups that want to plant trees within the city. Includes tree care information, volunteer opportunities, and planting FAQs.
Islais Creek
- http://www.islaiscreek.org/
- Friends of the creek collect articles on local development plans and environmental issues. Also lists the organization's events.
Rainforest Action Network
- http://www.ran.org
- Headquarters of group that works to protect the Earth's rainforests and support the rights of their inhabitants through education, grassroots organizing, and non-violent direct action.
San Francisco Zoo
- http://www.sfzoo.org/
- The largest zoological park in Northern California and one of the Bay Area's most popular cultural and recreational attractions, the San Francisco Zoo is home to over 250 species of exotic and domestic mammals, birds, reptiles, amphibians, fish and invertebrates
Surfrider Foundation
- http://www.sfsurfrider.org/
- Dedicated to protecting the local beaches and water. Includes newsletters, photo gallery and "Respect the Beach", a primer on coastal ecology awareness.