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🌐 Article 6 of the Paris Agreement
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Foundations of Article 6Lesson 2 of 35 min readParis Agreement Article 6.2, 6.4, 6.8; CATF Overview 2024

The Three Tracks: 6.2, 6.4, and 6.8

Article 6 is not a single mechanism. It is a comprehensive framework with three distinct tracks. Each track reflects a different philosophy about how international climate cooperation should work, how much oversight is needed, and whether monetary carbon credits are the right instrument to use.

Overview of the Three Tracks

  • Article 6.2: Traded using ITMOs. Governance is country-designed. Corresponding adjustments are required. Primarily used for NDC achievement and international aviation (CORSIA).
  • Article 6.4: Traded using A6.4ERs. Governance is centralized under a UN Supervisory Body. Corresponding adjustments depend on the specific use case. Used for NDC achievement, results-based finance, or domestic efforts.
  • Article 6.8: Uses no credit instrument. Governed by the UNFCCC framework. Does not require corresponding adjustments. Geared towards financial assistance and capacity building.

Article 6.2: Bilateral and Multilateral Agreements

Article 6.2 is the most flexible track. It empowers countries to engage in cooperative approaches to trade emission reductions, leaving most design choices to the participating nations.

What Is an ITMO?

The traded unit under Article 6.2 is an Internationally Transferred Mitigation Outcome (ITMO). ITMOs can represent mitigation outcomes measured in tonnes of CO2e, or alternative metrics like kilowatt-hours of renewable electricity or square kilometers of forest protected. This flexibility allows countries to trade in units that align with their specific national accounting frameworks.

How Article 6.2 Works

Two or more countries formalize a cooperative approach. The host country authorizes the issuance of ITMOs, and the acquiring country applies them toward its NDC.

The rules strictly require:

  1. Authorization: The host country must formally approve each transfer.
  2. Corresponding Adjustment: The host country's national GHG inventory must be adjusted upward to show more emissions so that the reduction is only counted once globally.
  3. Transparency: Countries must track and report these approaches through biennial reports to the UNFCCC.

Think of ITMOs like transferring a voucher between two corporate expense accounts. If Company A earns a cost-reduction voucher and gives it to Company B, Company A's account must be debited by the exact same amount Company B is credited. The total savings in the combined system stay exactly the same.

Real-World Deployment

Article 6.2 has seen significant activity. As of March 2025, 97 bilateral agreements have been signed globally. Switzerland has been a massively active buyer, completing the very first formal ITMO transfer with Thailand in 2024.

Switzerland and Thailand (2024): Switzerland funded electric buses and solar installations in Thailand and received ITMOs in return. Thailand successfully applied corresponding adjustments to its national inventory, officially confirming that the reductions count only for Switzerland's NDC.

The primary strength of Article 6.2 is its robust flexibility, making it ideal for large-scale government transactions. Its main limitation is minimal standardization, meaning buyers and sellers bear full responsibility for ensuring environmental integrity.

Article 6.4: The Paris Agreement Crediting Mechanism

Article 6.4 creates the Paris Agreement Crediting Mechanism (PACM). This centralized, UN-supervised market serves as the official successor to the Kyoto CDM.

The Supervisory Body

A 12-member Supervisory Body manages this mechanism. Responsibilities include:

  • Approving methodologies for calculating emission reductions.
  • Accrediting independent third-party auditors.
  • Reviewing and registering project activities.
  • Overseeing the issuance of credits and maintaining the international registry.

The A6.4ER: Two Types of Credit

The unit produced here is the A6.4ER (Article 6.4 Emission Reduction). The rulebook formally distinguishes two categories:

  1. Authorized A6.4ERs: These are credits the host country formally authorizes for use toward another country's NDC. The host country must apply a corresponding adjustment to its own inventory.
  2. Mitigation Contribution Units: These credits are not authorized for international NDC use. They do not trigger a corresponding adjustment. They can proudly support domestic offsetting or results-based finance but cannot transfer the NDC accounting right to the buyer.

The distinction between authorized A6.4ERs and mitigation contribution units is crucial for corporate buyers. An authorized credit represents a genuine transfer of a nationally recognized emission reduction. A mitigation contribution unit supports real climate action but lacks the same NDC accounting guarantee.

Mandatory Levies

Article 6.4 imposes two mandatory levies on all issued credits to drive further climate equity:

  • Overall Mitigation in Global Emissions (OMGE): 2% of all issued A6.4ERs are automatically canceled. This ensures the mechanism actively contributes to a net reduction in global emissions rather than simply shuffling reductions around.
  • Share of Proceeds (SOP) for Adaptation: 5% of transaction proceeds are forcefully directed to the UN Adaptation Fund. This channels critical finance to help vulnerable communities manage the impacts of climate change.

Article 6.8: Non-Market Cooperative Approaches

Article 6.8 caters to climate cooperation that fundamentally avoids the trading of carbon credits.

Under this track, countries can cooperate through:

  • Direct financial transfers such as grants and concessional loans.
  • Technology transfers.
  • Capacity building and institutional training.
  • Policy support.

Since no credit is created, there is no corresponding adjustment. The Paris Agreement features a dedicated digital platform to facilitate these matches between funding sources and global projects.

How the Three Tracks Interact

A single country may comfortably participate in Article 6.2 bilateral agreements, host Article 6.4 projects, and receive Article 6.8 assistance all at the same time.

The most critical interaction lies between Article 6.2 and Article 6.4. An A6.4ER authorized by a host country becomes, in effect, an ITMO. Finding its origin mechanism matters less than ensuring the correct corresponding adjustment is permanently applied. Meanwhile, Article 6.8 operates entirely independently as a non-market lane.

Key Takeaways

  • 1Article 6.2 enables flexible bilateral ITMO trades between governments, with corresponding adjustments required to prevent double counting
  • 2Article 6.4 creates a centralized, UN-supervised crediting mechanism (PACM) that issues A6.4ERs under strict Supervisory Body oversight
  • 3A6.4ERs come in two types: authorized credits (requiring CAs, usable for NDC achievement) and mitigation contribution units (no CA, domestic use only)
  • 4Article 6.4 imposes a 2% OMGE cancellation and 5% SOP levy to drive net global mitigation and fund adaptation
  • 5Article 6.8 covers non-market cooperation such as grants, technology transfer, and capacity building - no credits are generated
  • 6A single country can participate in all three tracks simultaneously

Knowledge Check

1.Under Article 6.2, what is the unit that is traded between countries in a cooperative approach?

2.Which of the following correctly describes the two types of A6.4ERs produced under Article 6.4?

3.What percentage of issued A6.4ERs is automatically cancelled under the Overall Mitigation in Global Emissions (OMGE) requirement, and what is its purpose?

4.As of March 2025, which countries completed the first formal ITMO transfer under Article 6.2?

5.Article 6.8 differs from Articles 6.2 and 6.4 in which fundamental way?

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