EU CBAM: Carbon Border Adjustments and the Next Trade Politics

The EU's Carbon Border Adjustment Mechanism entered transitional reporting in October 2023 and begins charging fees in 2026. The mechanism prices imported steel, cement, aluminum, fertilizer, and electricity to match the EU ETS carbon price. Adele Morris's Brookings work and Peterson Institute analysis frame what CBAM solves and what it provokes.

The European Union's Carbon Border Adjustment Mechanism (CBAM) is the most consequential climate-trade policy innovation in two decades. It charges imports from non-EU countries a carbon-equivalent fee on the embedded emissions of covered products, beginning with cement, iron, steel, aluminum, fertilizers, electricity, and hydrogen. The transition phase started in October 2023; full implementation begins in 2026. What CBAM does, what it does not do, and what comes next are substantial questions for global climate and trade policy.

How CBAM Works

Importers of covered products into the EU must report the embedded emissions of the goods. Beginning in 2026, they must purchase CBAM certificates corresponding to the embedded emissions, at prices set to match the EU ETS allowance price. Exports from countries with comparable carbon-pricing regimes (or comparable regulatory constraints) can be partially or fully exempted from CBAM charges through documentation.

The framework is structurally elegant. It removes the competitive disadvantage that European producers face under the EU ETS (which charges them for emissions while non-EU producers pay nothing). It creates incentives for non-EU producers to either reduce their emissions or face the equivalent charge at the border. It maintains WTO compatibility through the parallel-treatment-of-imports construction.

What It Covers and What It Does Not

The 2023-2026 transition covers carbon-intensive basic materials where leakage risk is highest. Steel, cement, aluminum, fertilizers, electricity, hydrogen. These are sectors where European production faces the most direct cost competition from countries without comparable carbon pricing, and where embodied emissions are large enough to make the policy effect meaningful.

The framework does not cover finished goods or services. A European car-maker is not charged CBAM on its imported steel; the steel itself is. But a Chinese car importing into the EU is not charged CBAM even though it embodies substantial steel emissions. The exclusion of finished goods is politically expedient but economically inconsistent, and the 2030 review is expected to extend coverage.

The Geopolitical Spillovers

CBAM has produced visible policy responses in major exporting countries. China announced an expansion of its own emissions trading system in 2024 partly because retaining carbon revenue domestically is preferable to ceding it to EU importers. Turkey is considering a domestic carbon price for the same reason. India has signaled it may develop a carbon-pricing framework to avoid CBAM exposure.

The strategic logic is that CBAM gives non-EU countries an incentive to develop their own carbon pricing — not because they want to, but because it captures revenue that would otherwise flow to EU importers. This is the "ratcheting" mechanism that climate-policy designers have been seeking for decades: a way to extend carbon pricing globally without requiring international agreement.

The WTO Compatibility Question

The WTO framework permits border adjustments that mirror domestic taxes — a value-added tax on imports, for example. The harder legal question is whether CBAM mirrors a "tax" in the WTO sense, or whether it is a regulatory measure that the WTO treats differently. The EU's legal team has constructed CBAM to look like a tax — the certificates are priced like the EU ETS allowance, the documentation mirrors VAT-style border procedures — but litigation is widely expected.

If CBAM is challenged, it will likely take years to resolve. The WTO dispute-settlement system has been in partial paralysis since the US blocked Appellate Body appointments. The procedural delays may allow CBAM to operate effectively before any decisive ruling, which could entrench it as a precedent for similar measures elsewhere.

The US Response

The US has not adopted a federal carbon tax. The IRA's subsidy structure provides a different mechanism — making clean alternatives cheaper rather than fossil fuels more expensive — but does not produce the kind of carbon price CBAM mirrors.

This creates an asymmetry. EU CBAM does not directly target US exports because the US lacks a comparable carbon-pricing regime, but the EU could in principle assess CBAM against US imports if the legal framework supports it. The political-economy effect is that the US faces increasing pressure to develop its own carbon pricing or border adjustment, partly because doing so would capture revenue domestically rather than ceding it to EU importers.

Several US carbon-border-adjustment proposals have been introduced. The Coons-Cornyn proposal (2023) is the most bipartisan version. None has moved through Congress, but the framework has measurable support across the spectrum and could gain traction depending on the political configuration after 2024.

The Developing-Country Concerns

Developing countries have raised substantial objections to CBAM. The framework charges imports without accounting for the historical emissions imbalance — wealthy countries built their economies on unconstrained emissions; CBAM imposes constraints on countries that did not. The fairness arguments are real but the policy has proceeded anyway, with limited concessions in the form of transition periods and technical assistance.

India and South Africa have been the most vocal critics. China has been more pragmatic, partly because its own carbon-pricing system can absorb the framework. Smaller exporters without the political and economic capacity to develop their own pricing face the most significant disadvantage.

The Honest Reading

CBAM is the most consequential climate-trade policy in decades. Its structural logic — extending carbon pricing globally through border adjustments rather than through international agreement — has produced visible policy responses in major exporting countries within two years of announcement. The framework's WTO compatibility, its distributional effects on developing countries, and its eventual expansion to finished goods are the open questions for the next decade. The US is under increasing pressure to develop a similar framework, partly to capture revenue domestically and partly to align with European climate-trade architecture. Whether the next administration moves in that direction or continues the subsidy-only approach is the most consequential US climate-trade question of the 2020s.

The Next Decade's Trade Architecture

CBAM may be the first move in a broader reshaping of trade policy around climate considerations. Other dimensions — labor standards, deforestation, human rights — are candidates for similar border- adjustment frameworks. Whether the WTO architecture survives multiple climate-adjacent border adjustments, or whether a new trade- governance framework emerges to accommodate them, is the institutional question for the 2030s. The intellectual case for extending border adjustments has been winning; the legal-institutional case is still being made.