Article 6.4 explained — how the Paris Agreement is reshaping the voluntary carbon market
At COP29 in Baku (November 2024), 196 parties formally activated Article 6.4 of the Paris Agreement — the mechanism creating a single, UN-supervised carbon market to replace the patchwork of voluntary standards (Verra, Gold Standard, ACR) that dominated the last decade. As of 2026, corporate buyers face a decisive choice: continue with legacy unregulated credits, or move to Article-6.4-aligned instruments.
The five pillars of Article 6.4
- Supervisory Body oversight. A UN-appointed body (the "6.4 SB") certifies methodologies. No more registry-shopping between Verra and Gold Standard for the loosest baseline.
- Corresponding adjustment. Every credit exported must be deducted from the host country's inventory — preventing double-counting between the seller nation and the buyer nation.
- Share of Proceeds. 5% of every 6.4 credit funds an Adaptation Fund for climate-vulnerable countries. This is a compulsory levy, not optional.
- Mandatory removal component. Article 6.4 favours removals (real forest, direct-air capture) over pure avoidance (avoided deforestation). Long-cycle removals score higher than short-cycle avoidance.
- Public registry. Every 6.4 credit will be registered on a UN-run public ledger with unique serial numbers — very close to what B3 already provides for UCS.
Why UCS is well-positioned
The Brazilian UCS was designed with the same architectural principles as Article 6.4: public registration, corresponding-adjustment friendly, third-party audited, removal-weighted. Brazil is one of the first countries to submit its 6.4 authorising legislation to the UNFCCC — with UCS proposed as one of the first eligible instruments.
What corporate buyers should do now
- Audit your existing offset portfolio. Any Verra REDD+ credit issued before 2024 will likely need to be re-audited or written down under 6.4.
- Prioritise ISIN-anchored instruments. Instruments already registered on a public exchange (like UCS on B3) will transition to 6.4 with minimal disruption.
- Build removal weighting into your net-zero plan. Under SBTi 2030 you cannot claim net-zero on avoidance credits alone.
- Prepare disclosure infrastructure. You will need to publish serial numbers and registry lookups for every retired credit.
GreenBelt's public B3 ISIN registry gives you every disclosure field the Article 6.4 framework will require, ready to export as a signed PDF for your compliance team.