ART requires independent third-party validation and verification of all Participant programs following the requirements and frequency outlined in the TREES Validation and Verification Standard, v1.0.  All validation reports, verification reports, and verification statements will be publicly posted in the ART Registry following ART review and acceptance.  Once a Participant has completed all required steps and the ART Board has approved issuance, ART will issue serialized emission reduction credits to the Participant’s account.

TREES Validation and Verification Process

ART-approved VVBs must execute a Participant-specific TREES Validation and Verification Conflict of Interest Form prior to each validation or verification. This document must be submitted to the ART Secretariat at for review and approval prior to validation or verification activities beginning.  All validations and verifications shall be conducted in accordance with the requirements of the TREES Validation and Verification Standard, v1.0.  VVBs must use the latest approved document templates when completing the Validation Report, Verification Report, or Verification Statement.

ART-Approved Validation and Verification Bodies (VVBs)

A list of validation verification bodies that have been approved by ART can be accessed here.

Becoming an ART-Approved Validation/Verification Body

Each ART validation and verification body (VVB) must be accredited for ISO 14065 with ART included in its scope by an International Accreditation Forum (IAF) member with whom ART has a Memorandum of Understanding (MOU). 

Entities seeking to become an ART-approved Validation and Verification Body can apply by sending a completed ART Validation and Verification Body Application form and an ART Attestation of Validation and Verification Body form to