Carbon Leakage Mitigation in International Trade

Carbon leakage arises when stringent climate policies in one jurisdiction drive production—and associated emissions—to regions with looser regulations, undermining global mitigation efforts. Mitigation strategies span price-based instruments, regulatory standards and cooperative frameworks. Border carbon adjustments (BCAs) or carbon border adjustment mechanisms (CBAMs) aim to equalise carbon costs by levying charges on imports based on their embedded emissions. Consumption-based accounting reallocates responsibility from producers to end-users and highlights the role of global supply chains in shifting emissions. Complementary measures include harmonised reporting standards, carbon clubs and sectoral agreements that foster alignment of carbon prices and technical assistance for vulnerable exporters. Empirical evidence suggests that well-designed BCAs can reduce leakage without unduly harming competitiveness, while cooperative approaches—such as revenue sharing and capacity-building for least developed countries—enhance acceptability and fairness. Ultimately, combining unilateral measures with multilateral cooperation offers the most promising path to decouple trade flows from carbon emissions and to maintain a level playing field in the global economy.

Research from Nature Portfolio

Recent studies have applied both territorial and consumption-based accounting to assess national mitigation targets and the extent of leakage through trade. Analyses tracking emissions flows across borders reveal that improvements in energy intensity and cleaner energy mixes have enabled several economies to meet territorial targets, yet consumption-adjusted emissions often increased due to outsourcing of carbon-intensive production. Socioeconomic factors—such as the structure of domestic energy systems and the pace of technology adoption—emerge as critical determinants of whether reductions in domestic emissions translate into global gains or simply shift burdens abroad. These findings underscore the need for timely monitoring frameworks that integrate trade-adjusted emissions metrics into policy review processes.

Carbon Leakage Mitigation in International Trade publication trend

The graph below shows the total number of articles in carbon leakage mitigation in international trade across all publications each year (not limited to Nature Index journals).

Technical terms

Carbon leakage: The displacement of greenhouse gas emissions from regions with stringent climate policies to those with weaker or no regulation, often via international trade.

Border carbon adjustment (BCA): A tariff or tax on imported goods proportional to their embedded carbon emissions, intended to level the playing field between domestic producers and foreign competitors.

Consumption-based accounting: A method of attributing emissions to the end-user of goods and services, adjusting territorial inventories by trade flows.

Emissions intensity: The level of greenhouse gas emissions per unit of economic output or product weight, often expressed as tonnes of CO₂ per unit.

Carbon club: A coalition of countries agreeing on common carbon pricing, border measures and enforcement to reduce leakage and enhance collective climate ambition.

Scope 1 and 2 emissions: Direct emissions from owned or controlled sources (Scope 1) and indirect emissions from purchased electricity, heat or steam (Scope 2), used to assess carbon intensity in trade instruments.

References

1. Revisiting Copenhagen climate mitigation targets. Nature Climate Change (2024).
2. The Economics of Border Carbon Adjustment: Rationale and Impacts of Compensating for Carbon at the Border. Annual Review of Economics (2023).
3. Border carbon adjustments: Addressing emissions embodied in trade. Energy Policy (2016).
4. Carbon Leakage, Consumption, and Trade. Annual Review of Environment and Resources (2022).
5. Making the EU Carbon Border Adjustment Mechanism acceptable and climate friendly for least developed countries. Energy Policy (2022).
6. Alternative carbon border adjustment mechanisms in the European Union and international responses: Aggregate and within-coalition results. Energy Policy (2023).