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In page TreePeople:

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Since its founding, the TreePeople staff have gone on to plant more than two million trees in the Los Angeles area and have developed one of the nation's largest environmental education programs.[citation needed] A recent program is T.R.E.E.S. – Transagency Resources for Environmental and Economic Sustainability – demonstrating the feasibility and facilitates the implementation of integrated urban ecosystem management to increase the health and sustainability of our cities.[citation needed]