The Global Effects of CBAM: What Research Finds

Meta Description: New research from Clausing, Colmer, Hsiao and Wolfram finds CBAM can boost competitiveness, cut leakage and advance climate action without disproportionately harming lower-income countries.

Target Keywords: CBAM global effects, CBAM research 2026, carbon border adjustment economic effects, CBAM developing countries, emissions intensity income-neutral

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The Research Behind the Headlines

A July 2026 working paper by Kimberly Clausing (UCLA), Jonathan Colmer (UVA), Allan Hsiao (Stanford) and Catherine Wolfram (MIT) provides the most comprehensive plant-level analysis yet of how carbon border adjustment mechanisms (CBAMs) affect global trade, emissions and welfare.

"Using plant-level data for aluminum and steel, which account for 11% of global CO2 emissions, we document that emissions intensity is income-neutral and uncorrelated with production costs." Clausing, Colmer, Hsiao & Wolfram, "The Global Effects of Carbon Border Adjustment Mechanisms" (July 2026)

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Two Surprising Facts About Emissions Intensity

The authors compiled plant-level data covering the near-universe of global aluminium and steel producers, sectors that account for 11% of world emissions and more than $1 trillion in international trade.

Fact 1: Emissions intensity is income-neutral

Sector	Emissions-intensity response to 1% GDP/capita increase
Aluminium	−0.04%
Steel	+0.03%

In plain terms: production in lower-income countries is no more emissions-intensive than production in higher-income countries. This has direct implications for who bears the burden of border adjustment. The pattern extends beyond metals: direct industrial emissions depend primarily on chemistry, not income, and power grids in lower-income countries are no more emissions-intensive than those in rich countries.

Fact 2: Emissions intensity is uncorrelated with production costs

Green plants operate across the cost spectrum. This means carbon pricing introduces a new margin of green comparative advantage. It doesn't simply tax the poor or the inefficient; it rewards the clean regardless of location.

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What CBAM Does: Three Effects

Effect	Mechanism
1. Levels the playing field	Border tax reduces carbon leakage and competitiveness losses from domestic carbon pricing
2. Encourages foreign regulation	Border credit for carbon taxes paid abroad gives governments an incentive to price carbon at home
3. Strategic complements	As more countries regulate, competitiveness and leakage concerns shrink for everyone — carbon taxes become strategic complements

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The Distributional Question

The EU itself has raised concerns that CBAM could disproportionately harm lower-income trading partners. The paper's answer is more nuanced:

• Because emissions intensity is income-neutral, CBAM doesn't systematically penalise poor countries
• The burden falls on carbon-intensive producers wherever they are, including rich countries with coal-heavy industries
• CBAMs can facilitate collective climate action without the regressive effects often assumed

"CBAMs can boost domestic competitiveness, reduce emissions leakage, and facilitate collective climate action, while largely avoiding disproportionate burdens on lower-income countries." Clausing, Colmer, Hsiao & Wolfram (July 2026)

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The Quantitative Model

The authors build a quantitative trade model simulating EU carbon taxation at $100/tCO₂, with and without a CBAM, leaving carbon taxes unchanged in the rest of the world.

Headline results (robustness across trade openness):

Scenario	Global emissions (Mt)	Global social welfare ($1B)
Without CBAM	−37.2	1.17–1.18
With CBAM	−46.3 to −52.6	1.23–1.31

The CBAM scenario delivers substantially larger global emission reductions and higher global social welfare (welfare net of emissions valued at a social cost of carbon of $100/t) across the entire robustness range.

Abatement elasticity results:

Scenario	Global emissions (Mt)	Global social welfare ($1B)
Without CBAM	−26.0 to −99.3	0.81–3.36
With CBAM	−34.7 to −126	0.65–4.77

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What This Means for Importers and Policymakers

For importers:

• The "green premium" logic is here to stay: clean production becomes a genuine competitive asset
• Border credits for domestic carbon pricing will increasingly shape supplier choices
• Expect CBAM to expand (downstream goods) as the evidence on its effectiveness mounts

For exporters in developing countries:

• The paper contradicts the "CBAM is a tax on the Global South" narrative: the burden is on carbon intensity, not income
• Building MRV capacity and decarbonising production routes is the rational strategy
• Domestic carbon pricing captures revenue at home instead of ceding it at the border

For policymakers:

• CBAMs are shown to be strategically complementary: the more countries adopt them, the better they work for everyone
• International coordination (linking schemes, mutual recognition) amplifies the collective-action benefit

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Key Takeaways

1. Aluminium and steel = 11% of global emissions, $1T+ in trade, the study's focus
2. Emissions intensity is income-neutral: poor countries aren't inherently dirtier
3. Emissions intensity is uncorrelated with production costs: clean isn't automatically expensive
4. CBAM delivers greater emission cuts and higher global welfare than carbon pricing alone
5. CBAM largely avoids disproportionate burdens on lower-income countries

Related: What Is CBAM? | How CBAM Affects Your Exports | EU ETS Price Tracker

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Frequently Asked Questions

Does CBAM hurt developing countries?

According to this research, no more than any other producer with carbon-intensive output. Because emissions intensity is income-neutral, the burden tracks carbon intensity, not income level.

How much does CBAM reduce global emissions?

In the model, EU carbon pricing at $100/t with a CBAM cuts global aluminium+steel emissions roughly 25–40% more than without a CBAM, across robustness parameters.

Is this peer-reviewed?

It's a working paper (July 2026) by four prominent economists, supported by the International Growth Centre. It uses plant-level data covering the near-universe of producers.

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Regulation Status

Field	Value
Last reviewed	2026-08-01
Based on	Clausing, Colmer, Hsiao & Wolfram (2026), EU Regulation 2023/956
Applies to	CBAM permanent phase (2026+)

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References

• Clausing, K., Colmer, J., Hsiao, A., & Wolfram, C. (2026). The Global Effects of Carbon Border Adjustment Mechanisms. Working paper, UCLA/UVA/Stanford/MIT, July 2026
• EU Regulation 2023/956
• European Commission — CBAM
• World Bank — CBAM Exposure Indexes

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Last updated: August 2026 | Sources: Clausing, Colmer, Hsiao & Wolfram (2026) working paper, EU Regulation 2023/956