The Clean Development Mechanism (CDM) is the world‘s largest greenhouse gas (GHG) offsetting mechanism to date. Although its future after 2020 is uncertain, policy-makers are currently considering the use of Certified Emission Reductions (CERs) from emission reductions delivered in the period up to, and including, 2020.

This discussion paper explores key issues and options to ensure robust accounting of international transfers from market mechanisms under Article 6 of the Paris Agreement. The paper first provides an overview of key issues that must be addressed to ensure robust account and highlights approaches to address them.

This discussion paper estimates the potential supply of certified emission reductions (CERs) from projects registered under the Clean Development Mechanism (CDM) for the period 2013 to 2020.

This study forms part of a broader project, supported by the German Environment Agency (Umweltbundesamt, UBA), with the primary objective to analyse the current situation and development of the international carbon markets.

The Paris Agreement includes Article 6 with several provisions, which allow for the use of the international carbon market. In this paper, Cooperative Approaches (CA, Art. 6.2-3) and the Mechanism for Sustainable Development and Mitigation (MSDM, Art.