Afọ atọ gara aga, United Voices for Healthier Communities kụrụ osisi 7,000 na saịtị 30 na Southern California. Afọ a, California Urban Forest Council na-ezube ịkụ osisi 3,400 na San Diego, Fresno bụ na Central Coast site na mmemme ahụ.
CAUFC na-ewe onye njikwa mmemme nwa oge iji rụzuo ọrụ a. Maka ozi ndị ọzọ, lee nkọwa ọnọdụ n'uju n'okpuru.