Friends of the Urban Forest
FUF was organized as a response to San Francisco's lack of trees. The group's first tree planted was a glossy privet on arbor day, 1981, in Noe Valley. As of 2006, the organization had planted approx. 40,000 trees. 
San Francisco was originally mostly sand dunes and had only a small population of native trees. Fog, wind, cold weather, and salty air made it difficult for native and planted trees to survive. Only buckeye and Pacific willow were common.
Most of the 90,000 trees in the city were planted in the 1880s through 1920s as part of large parks and properties. Monterey Pines and Eucalyptus trees were planted in the San Francisco Presidio, Stern Grove, and Golden Gate Park. However, these Monterey Pines have been affected by pitch pine canker and have been dying.
At 12%, San Francisco's tree canopy cover remains considerably under the 22% national average. Benefits to planting more trees include aesthetics, improved property values (mature trees are said to increase surrounding property values by approximately 1%), helping with global warming by absorbing carbon dioxide and providing oxygen, and energy savings due to increased tree canopy.
Even at more than 5,000 trees per year as of 2006, San Francisco's tree-planting efforts were modest compared to other cities in California and throughout the world. That year Los Angeles announced plans to plant one million trees, and the United Nations had raised funds to plant 121 million trees towards a goal of one billion trees. 
- Patricia Yollin (2006-11-19). "Group brings city under the canopy:For 25 years, the Friends of the Urban Forest has planted trees and united San Franciscans to green what was once largely sand dunes". San Francisco Chronicle.
- Ron Sullivan and Joe Eaton (2008-02-29). "Helping urban trees to thrive". San Francisco Chronicle.
- Robert Hollis (2006-12-24). "Trees make even Wallets Green:When they're planted in neighborhoods, property values usually grow, too". San Francisco Chronicle.
- fuf.net - official site
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