One of the fundamental principles of the CDM is that the participation by Parties is voluntary:
Participation by Parties in a CDM project activity is voluntary (3/CMP.1, Annex, paragraph 28).
Written approval of voluntary participation is a requirement for validation:
The designated operational entity shall:
- Prior to the submission of the validation report to the Executive Board, have received from the project participants written approval of voluntary participation from the designated national authority of each Party involved, including confirmation by the host Party that the project activity assists it in achieving sustainable development (3/CMP.1, Annex, paragraph 40).