The Paris Agreement provides the primary framework for the current United Nations carbon credit mechanism through Article 6, which establishes international cooperation for reducing greenhouse gas emissions. Adopted in 2015, the Paris Agreement allows countries to voluntarily trade carbon credits, known as Internationally Transferred Mitigation Outcomes (ITMOs), to help achieve their Nationally Determined Contributions (NDCs). Article 6 also created a UN-supervised global carbon market to encourage investment in emission reduction projects while ensuring transparency, environmental integrity, and the avoidance of double counting. This mechanism supports global efforts to combat climate change by enabling countries and organizations to reduce emissions in a cost-effective manner.
Although the Kyoto Protocol introduced earlier carbon market mechanisms such as the Clean Development Mechanism (CDM), Joint Implementation (JI), and International Emissions Trading (IET), the modern UN carbon credit system is now primarily governed by the Paris Agreement. The detailed rules for implementing Article 6 were finalized at the UN Climate Change Conference (COP26) in Glasgow, making the Paris Agreement the principal international framework for carbon credit trading in the current climate regime.
Why the other options are incorrect:
- Kyoto Protocol established the first international carbon market mechanisms but is no longer the primary framework for the current UN carbon credit system.
- Montreal Protocol focuses on protecting the ozone layer by phasing out ozone-depleting substances and is unrelated to carbon credit trading.
- UNFCCC is the parent international climate convention under which both the Kyoto Protocol and the Paris Agreement were adopted, but it does not itself operate the current carbon credit mechanism.