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Market Mechanisms in the Paris Climate Agreement: International Linkage under Article 6.2

The Harvard Project on Climate Agreements hosted a research workshop in Cambridge, Massachusetts, on July 14–15, 2016, the purpose of which was to identify options for elaborating and implementing the Paris Climate Agreement, and to identify policies and institutions that might complement or supplement the United Nations Framework Convention on Climate Change (UNFCCC) process. We were motivated by our recognition that while the Paris Agreement sets forth an innovative and potentially effective policy architecture for dealing with global climate change, a great deal remains to be done to elaborate the accord, formulate required rules and guidelines, and specify means of implementation.

Participants in the workshop – International Climate Change Policy after Paris – included twenty-one of the world’s leading researchers focusing on climate-change policy, representing the disciplines of economics, political science, international relations, and legal scholarship. They came from Argentina, Belgium, China, Germany, India, Italy, Norway, the United Kingdom, and the United States. (A list of workshop participants is here, biographies here, and the agenda here.)

The Harvard Project will next focus on communicating the ideas, insights, and recommendations of workshop participants to climate negotiators and policy makers, in the expectation that they might prove useful in elaborating and implementing the Paris Agreement. Each participant is preparing a brief—based largely on her or his presentation during the workshop. These briefs, together with a workshop summary, will be conveyed to participants in the Twenty-Second Conference of the Parties (COP-22) of the UNFCCC in Marrakech, Morocco in November 2016. This will be done in meetings with negotiators representing UNFCCC member governments and in a side-event panel at COP-22.

Today I wish to share with readers just one of these draft briefs – namely, my own – on the topic of “International Linkage under Article 6.2 of the Paris Agreement.”

A Key Challenge for Sustained Success of the Paris Agreement

For sustained success of the international climate regime, a key question is whether the Paris Agreement with its Intended Nationally Determined Contributions (INDCs), anchored as they are in domestic political realities, can progressively lead to submissions with sufficient ambition? Are there ways to enable and facilitate increased ambition over time?

Linkage of regional, national, and sub-national policies can be part of the answer. By “linkage,” I mean connections among policy systems that allow for emission reduction efforts to be redistributed across systems. Such linkage is typically framed as being between two (or more) cap-and-trade systems, but national policies will surely be highly heterogeneous under the Paris climate regime. Fortunately, research – by Gilbert Metcalf of Tufts University and David Weisbach of the University of Chicago – indicates that linkage between pairings of various types of domestic policy instruments may be feasible.

Linkage and the Paris Agreement

Experience indicates that linkage will bring both merits and concerns in most applications. To begin with the good news, linkage offers a number of important advantages. First, it offers the possibility of achieving cost savings if marginal abatement costs are heterogeneous across jurisdictions, which they surely are. In addition, linkage can improve the functioning of individual markets by reducing market power, and by reducing price volatility, although we should recognize that price volatility will also be transmitted from one jurisdiction to another by linkage. Finally linkage can allow for the UNFCCC’s important principle of Common but Differentiated Responsibilities (CBDR), but do so without sacrificing cost-effectiveness.

The possibility of linkage also raises concerns, including that there will be distributional impacts within jurisdictions, that is, the creation of both winners and losers. Also, linkage can bring about the automatic propagation from one jurisdiction to another of some design elements, in particular, cost-containment mechanisms, such as banking, borrowing, and price collars. In this and other ways, linkage raises concerns about decreased autonomy.

Linkage under Article 6.2 of the Paris Agreement

It was by no means preordained that the Paris Agreement would allow, let alone encourage, international linkage. Fortunately, the negotiations which took place in Paris in December, 2015, produced an Agreement that includes in its Article 6.2 the necessary building blocks for linkages to occur.

Under Article 6.2, emissions reductions occurring outside of the geographic jurisdiction of a Party to the Agreement can be counted toward achieving that Party’s Nationally Determined Contribution (NDC) via Internationally Transferred Mitigation Outcomes (ITMOs). This enables both the formation of “clubs” or other types of coalitions, as well as bottom-up heterogeneous linkage. Such linkage among Parties to the Agreement would provide for exchanges between compliance entities within the jurisdictions of two different Parties, not simply the government-to-government trading (of Assigned Amounts or AAUs), as was the case with the Kyoto Protocol’s Article 17.

Linkage among Heterogeneous Nationally Determined Contributions

There are three types of heterogeneity which are important in regard to linkage under Article 6.2 of the Paris Agreement. First is heterogeneity among policy instruments. As demonstrated by Metcalf and Weisbach (see above), not only can one cap-and-trade system be linked with another cap-and-trade system, but it is also possible to link a cap-and-trade system with a carbon tax system. In addition, either a cap-and-trade system or a tax system can be linked (via appropriate offsets) with a performance standard in another jurisdiction. (Linkage with systems employing technology standards are not feasible, however, because such systems are not output-based.)

A second form of heterogeneity that affects linkage and is potentially very important under the Paris Agreement is heterogeneity regarding the level of government action of the relevant jurisdictions. Although the Paris Agreement has as Parties both regional jurisdictions (in the case of the European Union) and national jurisdictions, sub-national jurisdictions are also taking action in some parts of the world. In fact, linkage has already been established between the state of California in the United States and the provinces of Québec and Ontario in Canada.

A third form of relevant heterogeneity is with regards to the NDC targets themselves. Some are in the form of hard (mass–based) emissions caps, while others are in the form of rate-based emissions caps, either emissions per unit of economic activity, or emissions per unit of output (such as per unit of electricity production). There are also relative mass-based emissions caps in the set of existing NDCs, such as those that are relative to business-as-usual emissions in a specific future year. Beyond these, there are other parties that have put forward NDCs that do not involve emission caps at all, but rather targets in terms of some other metric, such as the degree of penetration of renewable energy sources.

Combinations of various options under these three forms of heterogeneity yield a considerable variety of types of potential linkages, which may be thought of as the cells of a three-dimensional matrix. Not all of these cells, however, represent linkages which are feasible, let alone desirable.

The Path Ahead – Key Issues and Questions

There are a substantial number of issues that negotiators will eventually need to address, and likewise, there are a set of questions that researchers (including within the Harvard Project on Climate Agreements) can begin to address now. Among the key issues for negotiators will be the necessity to develop accounting procedures and mechanisms. Also, it will be important to identify means for the ITMOs to be tracked in order to avoid double-counting of emissions reductions. And a broader question is whether and how the UNFCCC Secretariat or some other designated institution will provide any oversight that may be required.

For research, three questions stand out. First, among pairings from the (3-D matrix) set of instrument–jurisdiction–target combinations that emerge from the three types of heterogeneity identified above, which linkages will actually be feasible? Second, within this feasible set, are some types of linkages feasible, but not desirable? And third, what accounting treatments and tracking mechanisms will be necessary for these various types of linkages? Future research will need to focus on these and related questions in order to achieve the potential benefits of Article 6.2 of the Paris Agreement. Please stay tuned as this work develops.

Misleading Talk about Decoupling CO2 Emissions and Economic Growth

You can call it my pet peeve or even my obsession, but whenever I read about the claimed “decoupling” of CO₂ emissions and economic growth, I get annoyed. Webster’s Dictionary defines decoupling as “eliminating the interrelationship” between two processes. But the interrelationship between CO₂ emissions and economic growth has certainly not been eliminated.

Decoupling is the wrong word and metaphor to describe what has been happening. When a caboose is decoupled from a train, it stops moving altogether. A better metaphor, although less linguistically appealing, would be a “slipping clutch.” The engine continues to transmit power, and as a result the driveshaft continues to rotate, but with less velocity than when the clutch was new.

What Has Been Happening

True enough, the carbon intensities of many economies in the world, particularly those of the industrialized nations, have – for many years – been falling, as those economies have become less energy intensive (less energy use per unit of economic activity – Gross Domestic Product or GDP), and therefore less carbon intensive. For each dollar of economic activity, CO₂ emissions are less than they used to be. For each unit of economic growth, there is less growth in CO₂ emissions than previously.

Furthermore, in some cases, as economies grow, CO₂ emissions can actually fall. First, picture an economy which is growing exclusively in its services sector. In this case, economic growth might be accompanied by no change in CO₂ emissions. Now picture an economy which is growing in its services sector, while shrinking in its manufacturing sector (sound familiar?). In this case, economic growth might be accompanied by reduced CO₂ emissions. Now add to this picture the presence of some public policies, such as those that cause the closure of coal-fired electric generation plants, as well as greater dispatch of electricity from natural gas-fired plants. The result: economic growth continues, with falling CO₂ emissions. But there has been no decoupling.

Confusion Due to Failure to Employ Appropriate Counterfactual

The problem and the confusion arises from a very common mistake in the popular press and, for that matter, in many casual conversations: failure to use the right counterfactual for analysis. The fact that GDP is rising while emissions are falling does not mean that GDP is not affecting emissions. The appropriate counterfactual for comparison is how much would emissions have fallen had there been no growth in GDP. Presumably, emissions would have fallen even more. The excess of emissions in the factual case, compared with the counterfactual case, is the magnitude of emissions growth due to (actually, “associated with”) economic growth. There has been no elimination of the relationship between the two, although the nature and the magnitude of that relationship has changed.

What Factors Affect CO₂ Emissions?

So, why have CO₂ emissions been declining in some countries? Or, more broadly and more to the point, what factors have affected CO₂ emissions? Four stand out (although there are others).

First, energy comes at a cost in all economies, and so economic incentives exist to economize on energy use through technological change. The energy-intensity of the U.S. economy has gradually fallen – almost monotonically – since early in the twentieth century.

Second, putting aside energy-intensity and focusing on carbon intensity, some technological change has worked against the use of carbon-intensive sources of energy. The most dramatic example, specific to the United States, has been the combination of horizontal drilling and hydraulic fracturing (fracking), which has caused a significant increase in supply and dramatic fall in the market price of natural gas, which has thereby led to a massive shift of investment and electricity dispatch from coal to natural gas.

Third, in the richer countries of the world, including this one, the process of economic growth has led to changing sectoral composition: heavy industry to light manufacturing to services. The deindustrialization of California is a graphic example. Does the fact that California’s economy has grown while emissions have fallen mean that decoupling has occurred? Of course not. And, in the California case, there has also been a fourth factor …

Fourth, public policies have in some jurisdictions of the world (Europe, the United States, and most of the other OECD countries) discouraged carbon intensity. In the USA, this has happened both through climate policies and other, non-climate policies. Some non-climate policies, such as EPA’s Mercury Rule, discourage investment, encourage retirement, and discourage dispatch of coal-fired electricity, while other non-climate policies, such as CAFE standards for motor vehicles, bring about greater fuel efficiency of the fleet of cars and trucks over time. Climate-specific policies have also mattered, such as in California, where the Global Warming Solutions Act of 2006 (AB-32) has brought down emissions through a portfolio of policies, including an economy-wide CO₂ cap-and-trade system.

The Bottom Line

So, yes, the carbon intensity of many economies continues to fall – for a variety of reasons, including but by no means limited to public policies. And, in some cases, the combination of energy price changes, technological change, changes in sectoral composition, and climate and other public policies has meant that emissions have fallen in years when economic growth has continued. But don’t be fooled. Economic growth does affect CO₂ emissions. There has been no decoupling; just some (desirable) slipping of the clutch.

Of course, this is not an anti-environment message. On the contrary, a belief in decoupling per se could lead to a misguided laissez-faire attitude about the path of CO₂ emissions. Being honest and accurate about the links between (desirable) economic growth and (desirable) CO₂ emissions reductions puts our focus and emphasis where it ought to be: finding better ways to have both.

The Future Role of Economics in the IPCC

Despite attacks from “climate skeptics” and other opponents of action on climate change, as well as its own missteps, the Intergovernmental Panel on Climate Change (IPCC) is broadly viewed as the world’s most legitimate scientific body that periodically assesses the economics of climate change for policy audiences. But growing inefficiencies and other limitations have made the IPCC an increasingly problematic forum for qualified scholars. This has been particularly true with regard to expertise from economics.

In an article that has appeared in the journal, Climate Change Economics, “Reforming the IPCC’s Assessment of Climate Change Economics,” my colleagues and I draw on our personal experiences writing the most recent IPCC report to identify some of the main problems faced by this institution and to propose some possible solutions. My co-authors are, in alphabetical order: Gabriel Chan (University of Minnesota), Carlo Carraro (Ca’ Foscari University of Venice), Ottmar Edenhofer (Technische Universität Berlin), and Charles Kolstad (Stanford University).

Background and Context

The IPCC was established in 1988 by the World Meteorological Organization and the United Nations Environment Program to assess and synthesize scientific research on climate change, its impacts, and response options. The IPCC is governed by its Plenary (composed of representatives of member governments), Bureau, Executive Committee, and Secretariat, which have distinct roles to provide oversight, develop procedures, and facilitate operation.

Coverage of the scientific literature is divided into three Working Groups that respectively assess climate change science, impacts and adaptation, and mitigation. Authors are nominated by national governments, and selected by the IPCC Bureau. Authors serve as Coordinating Lead Authors (CLAs), with responsibility for leading the writing of a chapter, or as Lead Authors (LAs), who serve on a chapter team and participate in the writing process. CLAs and LAs participate in numerous meetings held at diverse locations around the world. Other experts serve as Contributing Authors (CAs), but the process for nominating these contributors is less formal, and the CAs typically do not participate in meetings and deliberations.

The assessment cycle for each round of the IPCC begins with a scoping process, with government representatives, together with a large group of scholars and other interested parties, drafting outlines of each chapter of the IPCC. Following the scoping process, the IPCC Plenary approves the outlines, sometimes after some modification.

CLAs and LAs are then nominated and subsequently approved by the IPCC Bureau. CLAs and LAs serve as volunteer labor (although some have their travel expenses reimbursed). In the Fifth Assessment Report Working Group III process, Lead Author Meetings (LAMs) were convened four times from July, 2011, to July, 2013. These meetings took place in Changwon, Korea; Wellington, New Zealand; Vigo, Spain; and Addis Ababa, Ethiopia. Over the course of the LAMs, CLAs led their chapter teams to review relevant literature and prepare chapter text, tables, and figures.

At three points during this process, external Expert Reviewers and government representatives submit detailed comments on subsequent draft. These comments, numbering in the many thousands in AR5, are made public following the assessment cycle, and, are checked by appointed Review Editors, who confirm that authors have replied adequately to comments. After four drafting rounds, the Working Group reports are preliminarily finalized.

Towards the end of the assessment cycles, authors of each Working Group, primarily CLAs, engage in writing two summary documents for each report, a Technical Summary (TS) and a Summary for Policymakers (SPM). The Summary for Policymakers is subject to line-by-line approval by the IPCC Plenary (that is, the governments). By the way, in case you’re interested, I have written about these government approval processes at length in previous essays at this blog: Is the IPCC Government Approval Process Broken? (April 25, 2014); Understanding the IPCC: An Important Follow-Up (May 3, 2014); and The Final Stage of IPCC AR5 – Last Week’s Outcome in Copenhagen (November 4, 2014).

Finally, concurrent with much of the chapter-drafting process, a subset of CLAs and LAs from all three Working Groups convene to draft a Synthesis Report (SYR) and its own Summary for Policymakers.

I’m exhausted, just having written that summary of the multi-year process in which we were engaged in the IPCC’s Fifth Assessment Report.

Categories of Key Reforms

I hope you’ll turn to our article in Climate Change Economics to read about the procedural and substantive reforms we propose. So, here I’ll provide just a list as a guide to what you can find in the article.

We propose four potential procedural reforms that could lower the cost for volunteering as an IPCC author:

Improving interactions between governments and academics
Making IPCC operations more efficient
Clarifying and strengthening conflict of interest rules
Expanding outreach

In addition, we propose three reforms to the IPCC’s substantive coverage to clarify the IPCC’s role and to make participation as an author more intellectually rewarding:

Complementing the IPCC with other initiatives
Improving the integration of economics with other disciplines
Providing complete data for policymakers to make decisions

Looking Forward

My co-authors and I all found that working for the IPCC was at times enormously frustrating. As an IPCC author, particularly as a CLA, scholars can at times feel as if they are inside a political process, forced to respond to critical government comments based on political sensitivity, and even directly negotiating text with professional climate negotiators during the SPM Approval Sessions.

Despite such distractions and frustrations, however, the group of us believe that the IPCC remains a critical institution for the communication of scholarly knowledge about climate change. Engaging governments in often detailed deliberations over climate science, economics, and policy helps build a knowledge base that is broadly based. And the process of consensus-building around the SPM and the work of the underlying chapters play key motivating roles in driving international climate negotiations under the United Nations Framework Convention on Climate Change (UNFCCC).

Going forward, the greatest risk is that scholars with sound and balanced understanding of the relevant literature may be deterred from participating as IPCC authors, and thereby surrender the process to quasi-academics with political motivations. The potential harm to the policy process (and the reputation of academia) would be very great.

To prevent this from happening, the IPCC needs to reform its operational procedures and substantive scope so that qualified scholars perceive the time investment as authors to be worthwhile. At the same time, scholars of climate change economics should not dismiss the opportunity to provide a significant public service by volunteering for the IPCC in its future assessments.