Adam D. Orford, Assistant Professor of Law at the University of Georgia School of Law, is attending the 29th Conference of Parties to the United Nations Framework Convention on Climate Change as one of the American Bar Association’s observer delegation and will be sharing his thoughts on the experience here. The views expressed in this post are solely his and do not necessarily reflect the views or positions of the ABA or UGA.
Cross-posted to Medium.
Greetings from Baku! In this post, I will be diving into the Paris Agreement “Article 6” framework. These are the rules for running an international carbon credit trading program. It was widely suspected that COP29 would be the year that the UNFCCC parties finalized the carbon market “rulebook,” and indeed, it appears that they have done so.
Below, I introduce the concept of market-based solutions to environmental problems, discuss the application of those ideas to climate change, describe the Kyoto Protocol predecessors to Article 6, and examine the procedural machinations at Baku that resulted in the Article 6 rulebook nearing completion. I hope it’s informative!
For more information on COP29, see my earlier posts in this series introducing COP29, discussing “1.5-aligned” NDCs, and exploring climate finance. See also my quick updates on climate trade protectionism issues, and how people are talking about the U.S. election at COP29.
Market-Based Solutions to Environmental Problems
The idea for “market-based solutions” to environmental problems has been around for a long time. The basic idea is there are multiple ways to go about achieving pollution reduction outcomes.
In the classic “command and control regulation” paradigm, the government works out what must be done, and requires it. But in the market-based paradigm,, the government may simply determine what its ultimate objective is — say, a particular reduction in total pollution — and then facilitate a variety of approaches toward that goal.
One such market-based approach would be to allow groups of regulated units, facilities, or parties, to work out among themselves which will reduce their pollution, and then allow other units to pay for the opportunity to “take credit” for the pollution reductions of others. A government can ensure the goal is met by setting up clear and rigorous market oversight rules for these transactions. And that is really all there is to it.
For air pollution problems, market-based trading systems date back to the early 1970s. At that time, industries regulated under the then-new Clean Air Act wished to avoid having to marginally reduce pollution from every source in their facilities by instead substantially reducing, say, only one source, thereby achieving the same total reductions but at lower cost.
This is the so-called “bubble” approach to air pollution control, a reference to the idea of drawing a “bubble” around a whole facility and then calculating aggregate pollution rather than per-unit pollution. Instead of each smokestack at a plant reducing their pollution a little bit, one smokestack could entirely reduce its pollution, and all the other smokestacks in the bubble could “take credit” for a part of that reduction to meet their own obligations. The trading of credit wasn’t yet paid, but the important point is the exchange of credit.
After some initial experiments, the bubble approach expanded during the Carter and Reagan years. Beyond units at a single facility, industry and regulators experimented with allowing facilities to claim reductions at one plant by reducing emissions at another — a concept called “offsetting,” as one facility’s pollution is considered to be offset by reductions at the other. Indeed, Chevron v. NRDC, the famous 1984 administrative law decision setting out the recently defunct “Chevron doctrine,” arose out of an argument over the EPA’s ability to use of facility-level bubble concepts under one part of the Clean Air Act. Again, in these examples, an entity is “taking credit” for emissions at one location by reference to reductions accomplished elsewhere.
The first sector-wide application of a market regulatory system for air pollution was implemented under the Montreal Protocol to the Vienna Convention on Ozone Depleting Substances in the 1980s, where a cap on the total amount of certain pollutants was imposed, and regulated parties were required to hold allowances for any of their emissions — and to trade with each other for those allowances if they wished. This so-called “cap and trade” approach was also used much more broadly in the 1990s to control acid rain in the United States, following authorization of this approach by the 1990 Clean Air Act Amendments.
The trading systems created for these programs provided the formal infrastructure for buying and selling the right to take credit for pollution reductions. By abstracting the pollution problem to some total quantum of pollution in a region or even the whole world, and by providing for accurate inventory of the emissions contributing to the problem, it became possible to think about the process of pollution reduction as a project of reducing the total pollution output, and it became less important where, exactly, the reductions occurred. At least in theory. Plants that wanted to pollute more could pay plants that were able to pollute less for the credit to do so, and pollution reduction outcomes could be achieved while the invisible hand of the market ensured that this was accomplished with economic efficiency.
Applying the Idea to Greenhouse Gases
These models were on the minds of the UNFCCC negotiators in the mid-1990s. This work was complicated, however, by the fact that carbon is not simply an air pollutant emitted from smokestacks. While combustion-derived greenhouse gas emissions constitute the majority of the problem, release of carbon into the atmosphere, and removal of carbon from the atmosphere, is also a natural process. Carbon moves in enormous worldwide biogeochemical cycles between the atmosphere, oceans, land, and all life on earth, and therefore the “bubbles” used to conceptualize taking credit for contributing to greenhouse gas emissions reductions is a bit more complex as well.
Briefly, the best way to think about the carbon pollution problem is as human interference in biogeochemical flows. In the distant past, natural processes removed massive amounts of carbon from the atmosphere into plant life, and geological processes have eventually seen that fossil carbon buried deep underground. Under natural conditions, these huge carbon “reservoirs” would stay underground for millennia more. By digging up and burning them, human beings are moving massive amounts of fossil carbon into the atmospheric reservoir instead. Similarly, by converting land from various carbon-storing uses (say, to host jungles, forests, and grasslands) into agricultural fields or subdivisions, human beings are also moving carbon from the biotic reservoir into the atmospheric reservoir.
Thus, carbon markets must contemplate trading the ability to take credit not only for direct reductions in combustion emissions, but also for activities that slow deforestation and other land use changes, and that accelerate removal of carbon from the atmosphere once it is put there, which is just as good in theory as not putting it there in the first place.
That is, there are three distinct kinds of activities that carbon markets have to handle: direct emissions reduction, carbon reservoir protection, and atmospheric carbon removal. Furthermore, to be complete, these markets can also apply to other greenhouse gases. But otherwise, it’s always the same idea: allow one entity to pay to “take credit” for the carbon-related activities of another.
Many market-based systems have grown up to create traceable credits for these activities, including large “compliance” (government mandated) markets in the EU and California, and a worldwide “voluntary” carbon market subject to less formal rules but nonetheless used to purchase the right to claim emissions reductions. All of these systems require complex “methodologies” for calculating the emissions reduction outcomes of various types of “projects” or “activities” that can qualify. But the idea is always the same: entities who face some sort of greenhouse pollution reduction obligation or commitment may purchase credits from projects that produce such credits.
A massive amount of finance is theoretically available to construct the projects that produce and be paid for the pollution reduction credits that these activities may generate. But to be used, they require some sort of unified market rules to ensure the integrity of the emissions reductions claims being traded.
The Kyoto Protocol Clean Development Mechanism
The UNFCCC process has included efforts to create market systems for climate pollution since the 1997 Kyoto Protocol. The lessons from these efforts are currently being incorporated into the discussions about Paris Agreement Article 6.
Briefly, as discussed in a prior post, the Kyoto Protocol parties agreed to achieve “quantified emission limitations” by means of national “reduction commitments.”
As part of this, the Kyoto Protocol created three “mechanisms” for generating and trading emission reductions credits:
- Joint Implementation (JI) allowed nations to transfer “emissions reduction units” generated by “enhancing anthropogenic removals by sinks;”
- The Clean Development Mechanism (CDM) allowed industrialized nations to accrue “certified emissions reductions” through investment in “project activities” in developing nations. Importantly, CDM credits were required to represent “real, measurable, and long-term benefits related to the mitigation of climate change,” and “Reductions in emissions that are additional to any that would occur in the absence of the certified project activity,” a concept also known as “additionality;”
- Emissions Trading (ET) was the term for the Kyoto Protocol’s commitment to allow the parties to define “the relevant principles, modalities, rules and guidelines, in particular for verification, reporting and accountability for emissions trading,” in the future. The EU ETS, for example, was an effort to develop a Kyoto-compliant ET system.
Complex carbon crediting rules subsequently developed. Each activity and carbon management type required its own “methodologies” for inclusion in trading programs,, and among other things the most important activities subject to CDM, JI, and ET rules were:
- clean energy development activities;
- waste emissions reduction activities;
- activities to promote increases in terrestrial biological carbon stocks, like afforestation and reforestation;
- activities to protect existing terrestrial biological carbon stocks, meaning especially slowing deforestation.
A complete list of project activity categories is available here. The standard unit of measurement for each of these project types was set to 1 ton of CO2-equivalent (CO2e), i.e., one tradable credit constituted the equivalent of one ton of avoided CO2 emissions. These efforts also required detailed rules for determining baselines and assuring project additionality, and for validation, verification, and registration of various projects, The resulting credits were allowed to be applied to a portion of the industrialized nations’ reduction commitments undertaken under the Kyoto Protocol.
Paris Agreement Article 6
Article 6 is the Paris Agreement’s authorization for international carbon credit generation, offsetting, and trading. Per Article 6.1, the Paris Agreement parties recognized that “some Parties choose to pursue voluntary cooperation in the implementation of their nationally determined contributions to allow for higher ambition in their mitigation and adaptation actions and to promote sustainable development and environmental integrity.” The language hints at some of the discomfort that some parties feel regarding carbon credit trading mechanisms, but the Paris Agreement’s voluntary framework means that parties have agreed to allow those parties that wish to pursue these options to do so — provided they do so in a manner that maintains environmental integrity.
In fact, there are three separate mechanisms under the Paris Agreement that contemplate different kinds of market-based emissions reduction outcomes. These are:
- Article 6.2 states that parties may engage “on a voluntary basis in cooperative approaches that involve the use of internationally transferred mitigation outcomes towards nationally determined contributions.” Similar to the Kyoto Protocol’s JI mechanism, this imagines party-to-party cooperation where parties may take credit for mitigation actions undertaken in other countries.
- Article 6.4 creates a “mechanism to contribute to the mitigation of greenhouse gas emissions” with the aim of allowing “public and private entities” to invest in activities that “contribute to the reduction of emission levels in the host Party, which will benefit from mitigation activities resulting in emission reductions that can also be used by another Party to fulfil its nationally determined contribution.” Similar to the Kyoto Protocol’s CDM, this mechanism allows for third-party investment to create credits that the host party, or a third party, may use to demonstrate emissions reductions.
- Article 5.2, finally, explicitly contemplates a continuation of “results based payments” for “reducing emissions from deforestation and forest degradation,” and other land use management practices, i.e., a continuation of REDD+ payment systems. Reductions achieved through REDD+ programs could then be transferred under Article 6.4.
It should be noted that there is also a third program under Article 6, the so-called “non-market approaches” program of Article 6.8, which allows for coordination and cooperation without credit generation and trading.
In the text of the Paris Agreement, the basic unit of measurement is the “internationally transferred mitigation outcome,” or “ITMO,” defined elsewhere as a ton of CO2-equivalent emissions reduction, but it is also common to see references to the “Article 6, paragraph 4 emissions reduction” (A6.4 ER).
The parties agreed that concerns about the integrity of carbon credit market trading would have to be addressed, listing potential problems around “transparency, including in governance, and … robust accounting to ensure, inter alia, the avoidance of double counting.” (Art. 6.2). Therefore, like the Kyoto Protocol, all of these programs also required a robust set of new rules to ensure that the ITMOs generated and used under these programs would constitute real emissions reductions.
The “Article 6 rulebook” is the term for the numerous UNFCCC decisions that constitute the governance framework for Article 6 market mechanisms. The process of agreeing to these rules has been extremely technical and prolonged, and real progress was not made until COP26 in Glasgow in 2021. For example, after Glasgow there were fairly clear rules for how a company could invest in a renewable energy project in one country, generate ITMOs, and then be paid by a company in another country that could then use those ITMOs as credit for their own emissions reduction compliance obligations.
Further progress was made at COP28 in Sharm al-Sheik in 2022, where resolutions of issues included rules for avoiding double-counting, the use of remaining CDM-era credits, the use of market proceeds for adaptation funding in developing nations, were resolved. But significant questions were left unresolved, including especially how to define “removals” for purposes of these programs, which would apply to projects that directly or indirectly remove greenhouse gases from the atmosphere. The parties were unable to reach an agreement on this during the 2023 Conference of Parties in Dubai, and therefore the matter was left for Baku.
The COP29 Article 6.4 Deal
The big news out of Baku as COP29 began was that the parties had achieved consensus on completing the Paris Agreement Article 6 rulebook. The process by which this result was achieved, however, raised significant concerns.
As discussed above, the Paris Agreement parties have been debating for years what the final standards for Article 6 projects ought to look like. In August 2024, relying on ambiguities in its mandate, the Supervisory Body for the Article 6.4 mechanism (SBM) decided to simply adopt a set of new standards on its own, and request that at COP29 the parties simply accept this adoption as a fait accompli. This, the parties actually did, right at the outset of COP29, by agreeing to a decision simply “taking note” of the guidance documents.
This unusual process resulted in laudatory headlines about the first major success of COP29 being the completion of the Article 6 rulebook. But it was an entirely strategic move and runs quite contrary to the typical slow but more consensus-oriented approach of past COP negotiations. Consequently many parties objected. It appears, however, that the acceptance of these standards is a done deal, and they are discussed further below.
Now, rather than debating the standards, the parties are tasked with developing “further guidance” on the direction of the Article 6 program, which is immediately able to begin. These are under active debate at this time.
The two documents adopted by the Supervisory Body were SBM document A6.4-SBM014-A05, Application of the requirements of Chapter V.B (Methodologies) for the development and assessment of Article 6.4 mechanism methodologies, and SBM document A6.4-SBM014-A06, Requirements for activities involving removals under the Article 6.4 mechanism. The former
The SBM’s 15-page methodologies standard was intended to “provide the basis for claim and assessment of creditable emission reductions or removals, and whether activities satisfy additionality requirements, and all relevant [rules] and guidance from the SBM.” The document fleshes out broader statements included in Chapter V.B. of the initial decision on Article 6.4. The topics it covers include ensuring project additionality, appropriate setting of baselines, equitable sharing of project benefits, and calculation and avoidance of leakage. These are all fairly typical requirements for methodology documents, and are stated in fairly general terms that are unlikely to satisfy advocates very concerned about project credibility, but which will allow methodologies and projects to be developed for generation of credits.
The SBM’s 9-page removal standard included several important definitions, and additional rules. In addition to detailed monitoring and reporting requirements, the standard’s highlights include:
- “Removals” are defined as “the outcomes of processes by which greenhouse gases are removed from the atmosphere as a result of deliberate human activities and are either destroyed or durably stored through anthropogenic activities;”
- “Removals eligible for crediting” are calculated as the net change in greenhouse gas storage, minus the net change in emissions, minus leakage, minus crediting deficits, resulting from any given project. Leakage is the increase of greenhouse gases outside the project area as a result of the project, while credit deficits refer to negative credits assigned to past projects which have failed to produce intended results.
- “Reversals” are defined as negative emissions outcomes at a project site — say, for example, an afforestation project that burns down — and are subject to three sets of rules: “reversal risk assessment,” including a risk mitigation plan; “reversal related notifications and actions,” including various calculation updates and reports in the event of a reversal; and “remediation of reversals,” which includes the establishment of a “Reversal Risk Buffer Pool,” to which every project contributes, and from which lost carbon credits from reversals will be canceled without being used for credit.
With the creation of the these two standards, and their adoption by the parties, the Article 6.4 mechanism is now officially complete and ready to begin operating. The parties are currently also negotiating a lengthy decision authorizing Article 6.2 (state-to-state) cooperative programs. Thus, it appears that by the time COP29 is over, the Article 6 mechanism will, finally, be finished.
The above summary has only scratched the surface of the complex technical documents and methodologies underpinning Article 6.4 credit trading and Article 6 programs more broadly, and do not even begin to reveal the nuances of the positions of the parties that have been accommodated and rejected in the process of arriving at these outcomes. Furthermore, this is only the “end of the beginning,” as now, Article 6 implementation will begin, and lessons learned from that process will surely be integrated into future decisions.
What is clear, however, is that the finalization of the Article 6 rulebook occurred outside of typical COP negotiating processes, and that the parties ultimately agreed that this was necessary in order to finalize the program, even as many remain dissatisfied with the outcomes.
If you made it this far, you are better prepared to understand why Article 6 is important, what it does, and how its rules were finalized in Baku. My future posts will be shorter reviews of COP29 outcomes. More to come!