TreePeople inspires and supports the community to come together to plant and care for trees, harvest the rain, and renew depleted landscapes. They unite with communities to grow a greener, shadier and more water-secure city at homes, neighborhoods, schools and in the local mountains.

TreesAreGood is an educational website providing homeowners and other tree owners with reliable information regarding the benefits of trees and how to properly care for them in an urban environment. It provides the information necessary for consumers to make informed decisions when hiring tree care providers.

NC State University
This website shows a large list of benefits obtained from trees, based on studies.

International Society of Arboriculture
Through research, technology, and education, the International Society of Arboriculture (ISA) promotes the professional practice of arboriculture and fosters a greater worldwide awareness of the benefits of trees. It helps consumers finding certifies Arborist in the locality. Simply click on “Find an Arborist” and it will guide you through to find local tree experts.

Contractor State License Board – State of California
There are many groups of workers in each trade that provide a type of service without a contractor license. This is unlawful, creates a liability for the consumers and creates unfair competition for lawful contractors. To ensure a contractor has an active license and carries Worker’s Compensation insurance, you can use the tools provided by the state. Search the status by entering the name or contractor’s license number in the appropriate field and you can see the results.