This paper analyses 2 issues that remain unresolved in the Article 6 negotiations under the UNFCCC:
- accounting methods for single- and multi-year NDCs under Article 6.2;
- Potential transition of Kyoto era activities and units to the new Article 6.4 mechanism.
Considerations for accounting methods in Art 6.2 and implications of different methods on environmental integrity are discussed. Furthermore, the paper presents options for transitioning CDM activities and units to the post-2020 system.