Canopy: Trees for Palo Alto - Nonprofit centre for street, park, and garden trees in Palo Alto, California. Runs planting and education programmes.
CommunityTrees.Org - Nonprofit promoting the planting and care of trees in urban and community neighbourhoods.
Friends of Trees - Brings neighbours together for tree-planting and tree-care projects along city streets, in urban natural areas, and on school grounds.
Society of Municipal Arborists (SMA) - Professional association for urban and municipal arborists, promotes professional municipal arboriculture and public awareness of urban beautification.
Stable Slopes Forever - Dedicated to saving a Redwood forest in the heart of Southern Humboldt County, California.
Trees Forever - Facilitates planting and care of trees through action-oriented programmes that empower people, build community and promote environmental awareness.
