Michael A. Mehling, Geoffroy Dolphin, Robert A. Ritz

27(6) Journal of Environmental Policy & Planning (2025): 687-705

https://doi.org/10.1080/1523908X.2025.2591794

Adopted in 2023, the Carbon Border Adjustment Mechanism (CBAM) is a significant component of the European Union’s ambitious decarbonization strategy under the European Green Deal. This article questions the output effectiveness of the CBAM in achieving its stated objective, prevention of carbon leakage, while demonstrating its impact effectiveness as an instrument for advancing the global diffusion of carbon pricing. Empirical evidence for carbon leakage remains sparse, and implementation challenges might limit the capacity of the CBAM to counteract leakage even where it occurs. Nonetheless, the CBAM has already demonstrated a powerful spillover effect by incentivizing the acceleration of carbon pricing roadmaps across EU trade partners, suggesting that trade-related climate measures can effectively encourage global climate action. As the EU navigates the complexities of operationalizing the CBAM, it must balance several tradeoffs to maintain this important spillover effect. If successful, the CBAM could catalyze a virtuous cycle of carbon pricing adoption, reinforcing its potentially pivotal role in the EU’s toolbox to manage the environment-trade nexus.

Keywords: CBAM; Carbon Pricing; Carbon Leakage; Output and Impact Effectiveness; European Union