[1] The TreePeople organization advocates and works to support sustainable urban ecosystems in the Greater Los Angeles area through education, volunteer community-based action, and advocacy.

[2] Lipkis and a group of other teenagers began planting trees three years prior at summer camp in the San Bernardino Mountains.

[3] The TreePeople organization focuses on increasing Greater Los Angeles' urban forest by supporting people in planting and caring for trees at homes, on school yards, and in neighborhoods.

[citation needed] It educates and advocates for water conservation and stormwater capture in the urban landscape for Los Angeles' long-term sustainability.

[citation needed] 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.