The ambition of achieving carbon neutrality by 2050 is the cornerstone of the European Union’s climate strategy. While some might suggest that decentralizing carbon management to individual Member States would better respect the principle of subsidiarity, the rigorous analysis of climate law and market dynamics reveals an undeniable truth: the European climate mandate hinges on a unified market. Any move towards national CO2 markets would inevitably lead to a chaotic and counterproductive fragmentation, jeopardizing the very objectives enshrined in the Treaties.
The Irrefutable Case for Union-Wide Market
The existence of a Single CO2 Market is embodied by the EU Emissions Trading System (EU ETS), established by Directive 2003/87/EC. This robust legal framework is essential because it generates a single, or at least a highly convergent, carbon price across the entire continent. This harmonised price signal is the ultimate driver of economic efficiency. Under this cap-and-trade system, a uniform price incentivises polluters for whom abatement is cheapest to reduce their emissions first, thereby minimising the overall cost of reduction for the entire EU economy. From a legal standpoint, this unified mechanism guarantees the necessary consistency in climate policies among Member States, imposing stringent obligations for the Monitoring, Reporting, and Verification (MRV) of emissions.
Furthermore, a pan-European market is crucial for providing stability and predictability, which are vital for attracting long-term, high-capital investments required for the low-carbon transition. Without a guaranteed, stable carbon cost trajectory over 10 to 20 years, major infrastructure projects—like new renewable energy farms or industrial retrofitting—would face prohibitive regulatory uncertainty. The concrete results are already visible: Commission data confirms that emissions covered by the EU ETS are now approximately 50% lower than 2005 levels, with a significant 12% drop in the electricity sector alone, primarily driven by investments in renewables and nuclear power, which demonstrates the system’s effectiveness as a stable basis for investment decisions.
Preventing « Carbon Leakage » and Ensuring External Coherence
The greatest economic and environmental danger of national CO2 markets is the risk of « carbon leakage. » Should one Member State introduce weak or non-existent carbon regulations, CO2-intensive industries would simply relocate production there to avoid higher costs elsewhere in the Union. This relocation does not reduce global emissions; it merely shifts them, undermining the collective European effort. A uniform carbon price across the EU eliminates this perverse competitive advantage, effectively deterring purely carbon-cost-motivated delocalisations.
This internal harmony is brilliantly complemented by the Carbon Border Adjustment Mechanism (CBAM – Regulation 2023/956). CBAM serves as the essential external shield for the EU ETS. It requires importers in certain energy-intensive sectors (like steel and cement) to pay a carbon cost equivalent to that borne by EU producers. From a legal perspective, CBAM relies on the EU’s broad environmental competence (Article 191 TFEU) to manage this inherently transnational issue. The combination of the Single CO2 Market and CBAM ensures carbon neutrality between EU industries and imports, preventing the ecological transition from being circumvented by « carbon-cheap » products from abroad. This integrated approach is already compelling non-EU exporters, such as Indian steel producers, to anticipate « greening » their processes to remain competitive in the European market, demonstrating the EU’s global regulatory influence.
Legal Authority and Institutional Mandate
The EU’s collective intervention in setting a common CO2 framework is fully legitimate under the Treaties. The principle of subsidiarity (Article 5 TEU) dictates that the Union intervenes precisely when objectives—like tackling climate change—cannot be adequately achieved by Member States acting alone. Furthermore, the principle of proportionality ensures that measures like the EU ETS and CBAM are adapted and necessary for preventing carbon leakage and reducing emissions. The strategic blending of environmental law with trade law in the EU ETS and CBAM demonstrates a sophisticated and legally sound approach, establishing a stable and shared foundation that prevents regulatory instability and ensures long-term predictability for all economic actors. The integrity of the EU’s climate goals and its global competitiveness are inseparable from the unity of its carbon market.
Sources :
https://www.europarl.europa.eu/thinktank/en/document/EPRS_BRI(2022)698889?
https://www.ecologie.gouv.fr/politiques-publiques/marches-du-carbone-seqe-ue?
https://www.europarl.europa.eu/thinktank/en/document/EPRS_BRI(2022)698889?
https://www.sciepublish.com/article/pii/586?
