Emissions trading

Emissions trading
Name	Emissions trading
Type	Market-based environmental policy

Emissions trading is a market-based policy instrument that allocates tradable permits or credits to limit releases of pollutants such as carbon dioxide, methane, sulfur dioxide, and nitrogen oxides. It links regulatory targets with financial incentives, enabling participants in cap-and-trade or baseline-and-credit arrangements to buy and sell allowances to meet compliance obligations while incentivizing cost-effective reductions. Emissions trading has been implemented in diverse contexts by entities including national governments, regional blocs, and subnational authorities.

Overview

Emissions trading systems create scarcity by setting a quantitative cap on total allowable emissions and distributing tradable units among regulated entities such as European Union, United States, China, California, and Japan. Market participants—often energy firms, industrial manufacturers, and aviation carriers like International Air Transport Association members—trade permits through exchanges or over-the-counter platforms operated by institutions such as Intercontinental Exchange or Nasdaq. Regulatory frameworks rely on registries, monitoring, reporting, and verification procedures developed with input from organizations including United Nations Framework Convention on Climate Change, World Bank, International Civil Aviation Organization, and national agencies like the Environmental Protection Agency.

Mechanisms and Market Design

Key design elements include cap-setting, allocation methods, banking and borrowing rules, price stability mechanisms, and compliance periods; designers draw on economic theory advanced by scholars associated with MIT, Harvard University, and London School of Economics. Allocation can be by auction, grandfathering, or benchmarking, with auctions administered by entities such as European Commission or state treasuries; secondary markets provide liquidity through platforms like Chicago Climate Exchange (historical) and private brokers. Price controls—floor and ceiling mechanisms—are used in systems modeled on mechanisms proposed in literature by economists linked to University of Chicago, Columbia University, and Stanford University. MRV (monitoring, reporting, verification) protocols are informed by standards from International Organization for Standardization and reporting frameworks employed by agencies including Department of Energy offices and environmental regulators.

Types of Emissions Trading Systems

Common architectures include cap-and-trade systems such as the European Union Emission Trading Scheme and the Regional Greenhouse Gas Initiative, baseline-and-credit programs used in offset markets like those overseen under Clean Development Mechanism frameworks, and hybrid systems that combine emissions trading with carbon taxes as seen in policy mixes implemented by Canada provinces and Switzerland. Sectoral approaches target specific industries—power generation, cement, steel—mirroring pilot programs in jurisdictions such as South Korea, New Zealand, and Mexico. Offsets and project-based credits derive from protocols managed by organizations like Verified Carbon Standard and Gold Standard, and are integrated into compliance systems with linkage agreements negotiated between parties including Norway and Iceland.

History and Global Implementation

Early market-based precursor mechanisms emerged in emissions control programs of the United States for sulfur dioxide under the Clean Air Act Amendments of 1990 and in tradeable permit proposals debated at Rio Earth Summit. The Kyoto Protocol negotiated under United Nations Framework Convention on Climate Change established mechanisms including Joint Implementation and the Clean Development Mechanism, influencing later regional schemes such as the European Union Emission Trading Scheme launched in 2005. Subsequent waves of implementation include national systems in China and Japan, subnational initiatives like California Cap-and-Trade Program and the Regional Greenhouse Gas Initiative in the northeastern United States, and linkage negotiations exemplified by agreements between European Union and neighboring states.

Economic and Environmental Impacts

Empirical assessments draw on case studies from the European Commission evaluations of the EU ETS, academic analyses from institutions like Resources for the Future and National Bureau of Economic Research, and reports by Intergovernmental Panel on Climate Change. Research finds emissions trading can lower compliance costs compared with command-and-control regulation by enabling least-cost abatement across firms, spur innovation via price signals referenced in studies from Carnegie Mellon University and University of California, Berkeley, and create revenue streams through auctioning used by treasuries such as California State Treasury for public programs. Environmental integrity depends on cap stringency, additionality of offsets, and enforcement by regulators including national environmental ministries and agencies such as the Environmental Protection Agency.

Criticisms and Challenges

Critiques involve concerns over overallocation and permit windfalls documented in assessments by the European Court of Auditors, carbon price volatility studied by analysts at Bank of England and International Monetary Fund, and the risk of leakage prompting border adjustment discussions in forums like the World Trade Organization and among policymakers in European Parliament. Additional issues include monitoring and enforcement capacity in developing countries as highlighted in reports by the World Bank, distributional impacts debated in legislatures such as the United States Congress and parliaments of Australia and United Kingdom, and interaction with other climate policies scrutinized by research centers at Princeton University and Yale University.

Case Studies and Notable Programs

Notable implementations include the European Union Emission Trading Scheme, the California Cap-and-Trade Program, the Regional Greenhouse Gas Initiative, the Korean Emissions Trading Scheme, and China's national carbon market initiated after provincial pilot programs in Guangdong and Hubei. International mechanisms tied to the Kyoto Protocol—the Clean Development Mechanism and Joint Implementation—generated extensive project-based credits; voluntary market standards such as Verified Carbon Standard and Gold Standard underpin many corporate purchase programs by firms like Shell, BP, and Microsoft. Lessons and reforms emerging from these programs have been analyzed in policy reviews by bodies like Organisation for Economic Co-operation and Development and United Nations Environment Programme.

Category:Environmental policy