Global Carbon Border Adjustment Mechanisms and Competition Effects

1. Introduction

A Carbon Border Adjustment Mechanism (CBAM) is a trade and competition-policy instrument designed to address carbon leakage. It places a carbon-related financial cost on imported products that are considered to embody greenhouse-gas emissions, broadly seeking to ensure that imported goods face a carbon cost comparable to domestically produced goods.

The most prominent example is the European Union Carbon Border Adjustment Mechanism, but the underlying concept has global significance. Similar or related approaches are being considered or developed in jurisdictions such as the United Kingdom, Canada, Australia and elsewhere.

CBAM sits at the intersection of:

• international trade law;
• competition law;
• climate regulation;
• industrial policy;
• subsidies;
• market access;
• carbon pricing;
• non-discrimination;
• supply-chain restructuring; and
• strategic economic competition.

The central competition question is:

Does a CBAM merely equalise environmental costs between domestic and foreign producers, or can it become a mechanism for protecting domestic industry and reshaping global competitive conditions?

A legally defensible CBAM should primarily correct a carbon-cost differential. A protectionist or discriminatory CBAM, however, could distort competition by favouring domestic producers, imposing disproportionate compliance costs on foreign firms, or encouraging countries to adopt competing carbon-border regimes.

2. Meaning and Economic Purpose of CBAM

A conventional carbon tax operates domestically. A CBAM extends the carbon-cost concept to imports.

For example:

• Producer A in Country X pays a domestic carbon price.
• Producer B in Country Y faces little or no carbon price.
• B exports carbon-intensive steel into Country X.
• A's production therefore becomes relatively more expensive.
• Production may migrate to Country Y.
• Country X loses industrial production while global emissions may not fall.

This is the classic carbon leakage problem.

CBAM attempts to reduce that disparity.

Simplified model

Importer's carbon adjustment = embedded emissions × applicable carbon price − recognised carbon price already paid

The precise calculation depends on the jurisdiction and product.

The competitive objective is therefore not necessarily to disadvantage foreign producers. In theory, it is to make:

Domestic carbon cost + production cost ≈ Imported carbon cost + production cost + border carbon adjustment.

3. Why CBAM Creates Competition Issues

CBAM can affect competition through several channels.

A. Cost equalisation

A CBAM can prevent foreign producers from obtaining a competitive advantage merely because their jurisdictions impose weaker carbon constraints.

This can promote competitive neutrality.

B. Protectionism risk

A domestic industry may lobby for high carbon-border charges that exceed the environmental justification.

That creates a risk that:

environmental regulation becomes disguised industrial protection.

C. Production relocation

Companies may relocate carbon-intensive manufacturing to countries with lower regulatory costs.

CBAM can therefore change the location of:

• steel production;
• aluminium;
• cement;
• fertilisers;
• chemicals;
• electricity-intensive manufacturing;
• hydrogen;
• downstream industrial production.

D. Small-firm exclusion

Large multinational corporations may be able to calculate embedded emissions and satisfy complex reporting requirements.

Small exporters may not.

Thus, CBAM can create a compliance-based barrier to entry.

E. Vertical effects

CBAM does not necessarily affect only the producer.

It can affect:

raw materials → manufacturer → processor → importer → distributor → final consumer.

The mechanism can therefore redistribute bargaining power throughout global supply chains.

4. CBAM and Market Definition

Competition authorities may need to distinguish between:

1. low-carbon and high-carbon products;
2. domestic and imported products;
3. substitute materials;
4. different production technologies; and
5. different geographic markets.

For example, if low-carbon steel becomes substantially cheaper after carbon adjustments than high-carbon steel, the relevant market may increasingly be divided according to carbon intensity rather than traditional product characteristics.

This could change market power.

A producer possessing:

• green steel technology;
• low-carbon electricity;
• proprietary emissions data;
• carbon-accounting software; or
• access to renewable energy

could obtain a significant competitive advantage.

5. CBAM and Abuse of Dominance

A dominant undertaking could potentially exploit CBAM-related infrastructure.

Examples include a dominant company controlling:

• emissions measurement technology;
• carbon certification;
• environmental verification;
• carbon-accounting platforms;
• emissions databases;
• low-carbon raw materials;
• green electricity;
• carbon credits.

Potential conduct could include:

• discriminatory access;
• excessive certification fees;
• refusal to supply emissions information;
• tying certification to unrelated services;
• exclusionary licensing;
• discriminatory interoperability.

Consequently, CBAM can create new bottlenecks in environmental-data markets.

6. CBAM and Cartel Risks

Carbon regulation may require competitors to exchange information concerning:

• emissions;
• production methods;
• energy consumption;
• decarbonisation investments;
• carbon costs;
• technological standards.

Some cooperation may be legitimate or environmentally necessary.

However, competitors could potentially use carbon-compliance mechanisms as a vehicle for exchanging commercially sensitive information.

For example:

Steel producers collectively exchange future carbon-cost and production-cost information under the justification of environmental compliance.

If the information exchange facilitates coordination of prices or output, conventional competition law may apply.

7. CBAM and State Aid

CBAM interacts closely with domestic subsidies.

Suppose Country A imposes a carbon price and simultaneously gives its steel industry substantial subsidies.

Country B may argue that its exporters are being placed at a competitive disadvantage.

Conversely, a CBAM could be accompanied by:

• tax rebates;
• electricity subsidies;
• green-production subsidies;
• free allowances;
• investment grants;
• preferential financing.

This creates the possibility of regulatory asymmetry.

A CBAM regime therefore needs to be assessed together with the domestic measures surrounding it.

8. WTO Non-Discrimination Principles

The principal international-law questions concern:

GATT Article I — Most-Favoured-Nation Treatment

Countries should generally avoid discriminatory treatment between equivalent products from different WTO members.

GATT Article III — National Treatment

Imported products should not receive discriminatory treatment compared with like domestic products.

GATT Article XX — General Exceptions

Environmental measures may potentially be justified under exceptions relating to:

• protection of human, animal or plant life or health; and
• conservation of exhaustible natural resources.

The critical issue is whether the measure is applied in a manner consistent with the requirements of the Article XX chapeau.

Thus:

Environmental purpose alone does not automatically immunise a CBAM from trade-law scrutiny.

9. Important Case Laws

There is not yet a large body of final judicial decisions specifically invalidating or approving the EU CBAM itself. Therefore, the most useful authorities are WTO and competition cases establishing principles that would likely influence litigation concerning carbon-border measures.

Case 1: United States — Import Prohibition of Certain Shrimp and Shrimp Products

US — Shrimp, WTO Appellate Body, 1998/2001

This is one of the most important environmental trade cases.

The United States restricted imports of shrimp harvested using methods that endangered sea turtles.

The Appellate Body accepted that environmental protection could fall within GATT Article XX(g), concerning conservation of exhaustible natural resources.

However, the application of the measure was problematic because of discriminatory and inflexible implementation.

CBAM significance

The case demonstrates that:

• environmental objectives can justify trade restrictions;
• environmental regulation must nevertheless be administered fairly;
• arbitrary discrimination can defeat an Article XX defence;
• developed countries cannot simply impose unilateral conditions without considering the circumstances of trading partners.

For CBAM, this is highly relevant where importing countries impose carbon standards on developing-country exporters.

Principle

Legitimate environmental purpose does not excuse discriminatory implementation.

10. Case 2: European Communities — Measures Affecting Asbestos and Asbestos-Containing Products

EC — Asbestos, WTO Appellate Body, 2001

France prohibited asbestos-containing products because of health risks.

The dispute concerned whether imported asbestos products were being treated inconsistently with WTO obligations.

The Appellate Body recognised the importance of protecting human health when assessing product distinctions.

CBAM significance

The case is relevant to the question of whether products should be distinguished according to environmental characteristics.

CBAM regimes may distinguish between:

• carbon-intensive products;
• low-carbon products;
• products manufactured using different technologies.

The Asbestos reasoning supports the proposition that regulatory distinctions may be legitimate where they correspond to genuine health or environmental characteristics.

Competition implication

The case helps support the idea that competition between products need not be assessed solely through physical characteristics or price.

Environmental characteristics may become economically and legally relevant.

11. Case 3: Brazil — Measures Affecting Imports of Retreaded Tyres

Brazil — Retreaded Tyres, WTO Appellate Body, 2007

Brazil imposed restrictions on imports of retreaded tyres, invoking environmental and health considerations.

The Appellate Body accepted that environmental and health objectives could fall within Article XX.

However, the measure had to satisfy the requirements concerning arbitrary or unjustifiable discrimination.

CBAM significance

This case is particularly important because it demonstrates that:

A measure can pursue a legitimate environmental objective while still being vulnerable because of how it is designed or applied.

A CBAM could therefore be challenged if:

• foreign products receive systematically harsher treatment;
• carbon calculations are inconsistent;
• exemptions favour domestic industry;
• equivalent foreign carbon prices are ignored;
• procedures are excessively burdensome for particular countries.

Competition implication

CBAM design must avoid creating a regulatory competitive advantage disguised as environmental protection.

12. Case 4: China — Measures Related to the Exportation of Various Raw Materials

China — Raw Materials, WTO Appellate Body, 2012

China imposed export restrictions on various raw materials.

China relied partly on environmental and conservation arguments.

The WTO dispute emphasised that environmental objectives do not automatically validate measures inconsistent with specific WTO obligations.

CBAM significance

This is relevant to countries attempting to manipulate global supply chains through environmental policy.

A state could theoretically use carbon regulation to:

• restrict exports;
• favour domestic downstream processing;
• secure strategic resources;
• protect domestic manufacturers.

Competition implication

CBAM-related policies could therefore interact with resource nationalism.

A country possessing critical low-carbon inputs might obtain significant strategic power over downstream industries.

13. Case 5: China — Measures Related to the Exportation of Rare Earths, Tungsten and Molybdenum

China — Rare Earths, WTO Appellate Body, 2014

China defended export restrictions partly on environmental and resource-conservation grounds.

The WTO bodies examined whether the measures genuinely corresponded to conservation objectives or operated as trade restrictions that advantaged domestic users.

CBAM significance

This case provides an important warning against dual-purpose environmental regulation.

A measure presented as environmental protection can have a substantial industrial-policy effect.

For CBAM analysis, regulators should therefore ask:

1. Does the carbon measure genuinely reduce emissions?
2. Is the methodology applied consistently?
3. Are domestic producers subject to comparable obligations?
4. Does the measure disproportionately favour domestic downstream industries?

Competition principle

Environmental justification should be connected to the actual structure and operation of the measure.

14. Case 6: India — Certain Measures Relating to Solar Cells and Solar Modules

India — Solar Cells, WTO Appellate Body, 2016

India required certain solar-power projects to use domestically manufactured solar cells and modules.

India defended its policy partly by reference to broader public-policy objectives.

The WTO found important aspects of the domestic-content requirements inconsistent with national-treatment obligations.

CBAM significance

The case is highly relevant to the interaction between climate policy and industrial protection.

Governments may pursue legitimate climate objectives while simultaneously seeking to develop domestic industries.

The legal difficulty arises where:

climate policy is structured in a manner that discriminates against foreign competitors.

Competition implication

A CBAM should not become a disguised mechanism for:

• favouring domestic green technology;
• excluding foreign low-carbon producers;
• creating national champions;
• reserving green markets for domestic companies.

15. Case 7: Canada — Certain Measures Affecting the Renewable Energy Generation Sector

Canada — Renewable Energy, WTO Appellate Body, 2013

Ontario introduced measures supporting renewable-energy generation, including domestic-content requirements.

The dispute examined the relationship between environmental/renewable-energy policy and discriminatory treatment of foreign goods.

CBAM significance

This is particularly important because it demonstrates that green industrial policy can generate competition and trade-law problems.

A government may legitimately want to accelerate decarbonisation but may not necessarily be free to structure its programme to favour domestic suppliers.

CBAM lesson

There is a significant difference between:

carbon neutrality

and

domestic-industry neutrality.

A legitimate CBAM should primarily address the former without unnecessarily violating the latter.

16. Case 8: Commission v Intel

CJEU, Case C-413/14 P, 2017

Although Intel was not an environmental case, it is important from the competition-law perspective.

The Court examined the assessment of rebates offered by a dominant undertaking and emphasised the importance of evaluating whether conduct is capable of producing anticompetitive foreclosure.

CBAM significance

The case provides a framework for analysing competition effects where carbon-related advantages are distributed through dominant firms.

For example, a dominant producer might offer:

• preferential low-carbon supply;
• rebates linked to emissions certification;
• exclusive access to green inputs;
• loyalty incentives tied to carbon-accounting systems.

The fact that an arrangement is environmentally justified would not automatically prevent competition-law scrutiny.

17. Case 9: Google Shopping

European Commission / General Court, Google Search (Shopping), 2021

The EU institutions examined Google's preferential treatment of its own comparison-shopping service within its dominant search ecosystem.

Although unrelated to carbon regulation, the case illustrates the principle that a dominant platform can distort competition by controlling an important gateway.

CBAM relevance

A future carbon economy may create dominant environmental-information platforms controlling:

• carbon-intensity databases;
• certification;
• emissions verification;
• carbon-adjustment calculations;
• sustainability rankings.

If such an infrastructure becomes indispensable, competition authorities could face a new category of environmental-data gatekeeping.

18. Case 10: Bronner v Mediaprint

CJEU, Case C-7/97, 1998

The Court considered the conditions under which refusal of access to an infrastructure controlled by a dominant undertaking could constitute an abuse.

CBAM significance

The case becomes conceptually important if carbon-compliance infrastructure develops into an essential commercial gateway.

Imagine a dominant emissions-data provider controls information necessary for exporters to access a major market.

The competition question could become:

Can the dominant infrastructure provider refuse access to carbon-verification or emissions-data infrastructure?

This creates an emerging carbon-compliance essential-facility problem.

19. Competitive Effects Across Global Markets

A. Steel

Steel is one of the clearest sectors.

Traditional blast-furnace steel can have substantially different emissions characteristics from hydrogen-based or electric-arc production.

CBAM may therefore shift competitive advantage toward:

• green hydrogen;
• renewable electricity;
• electric arc furnaces;
• high-quality scrap;
• low-carbon iron.

This could accelerate technological competition.

But it could also favour countries possessing cheap renewable electricity.

20. Aluminium

Aluminium production is highly electricity-intensive.

A CBAM can therefore reward producers with:

• low-carbon electricity;
• hydroelectric power;
• renewable energy;
• efficient smelting technology.

The result may be a geographic redistribution of aluminium production.

21. Cement

Cement is difficult to decarbonise because emissions arise not only from energy consumption but also from the chemical process of clinker production.

CBAM may therefore increase the competitive importance of:

• alternative binders;
• clinker substitution;
• carbon capture;
• low-carbon fuels.

This could create new technology markets.

22. Fertilisers

Fertiliser production, particularly ammonia, can have significant emissions.

CBAM can increase the competitiveness of:

• green hydrogen;
• green ammonia;
• renewable-powered production.

Countries with abundant renewable electricity may gain strategic advantages.

23. Developing-Country Competition

CBAM presents a major distributional problem.

A developing country may have:

• relatively carbon-intensive production;
• limited emissions-measurement capacity;
• limited access to renewable energy;
• limited capital for decarbonisation;
• smaller exporters.

Its exporters could therefore face both:

carbon cost + compliance cost.

A large multinational exporter may absorb these costs much more easily.

This can increase concentration.

24. CBAM and Small and Medium Enterprises

Compliance can require:

• emissions measurement;
• third-party verification;
• lifecycle assessment;
• reporting;
• documentation;
• carbon-price calculations;
• supply-chain tracing.

These requirements may be disproportionately expensive for SMEs.

Consequently:

CBAM can create a non-price barrier to entry.

A market may technically remain open to foreign competitors while practically becoming accessible mainly to large firms.

25. Carbon Accounting as a Competitive Infrastructure

One of the most important future competition issues is carbon-data control.

The value chain may become:

Production → emissions measurement → verification → certification → CBAM declaration → customs clearance → market access.

If a few companies control this infrastructure, carbon compliance itself can become concentrated.

This creates possible markets for:

• emissions software;
• carbon accounting;
• verification;
• environmental auditing;
• carbon-intelligence platforms.

Competition law may therefore move from regulating only product markets toward regulating environmental-information infrastructure.

26. CBAM and Digital Platforms

Digital platforms can facilitate CBAM compliance.

AI systems may calculate:

• embedded emissions;
• supplier emissions;
• transport emissions;
• carbon prices;
• regulatory obligations.

If a dominant platform controls these functions, it could potentially:

• rank suppliers according to carbon scores;
• determine market access;
• impose discriminatory fees;
• bundle carbon compliance with other services;
• favour affiliated suppliers.

Thus, digital competition law and carbon-border regulation are increasingly interconnected.

27. Carbon Clubs and Fragmentation

A major global concern is the emergence of competing carbon-border systems.

For example:

EU CBAM → UK carbon border system → North American approach → Asian carbon-border measures

could produce multiple regulatory zones.

Exporters may then have to comply with several:

• emissions methodologies;
• verification systems;
• reporting standards;
• carbon-price calculations.

This increases transaction costs and may favour multinational companies.

28. Risk of a Global Carbon Tariff War

If countries perceive CBAM as disguised protectionism, they could retaliate.

Possible responses include:

• WTO disputes;
• retaliatory tariffs;
• domestic subsidies;
• export restrictions;
• competing CBAMs;
• reciprocal carbon charges.

The result could be a carbon-related trade conflict.

The ideal system therefore requires international coordination.

29. Competition Between Carbon Standards

Different countries may calculate embedded emissions differently.

For example:

Country A: direct production emissions only
Country B: direct + electricity emissions
Country C: full lifecycle emissions

This creates regulatory arbitrage.

A producer could potentially redesign its supply chain to obtain favourable treatment under the least burdensome methodology.

This means that standardisation itself becomes a competition-policy issue.

30. CBAM and Green Innovation

CBAM is not necessarily anticompetitive.

It can stimulate:

• clean production;
• renewable energy;
• green hydrogen;
• carbon capture;
• energy efficiency;
• low-carbon materials;
• emissions-monitoring technologies.

If designed correctly, CBAM can change competition from:

"Who can produce most cheaply while externalising environmental costs?"

to:

"Who can produce most efficiently at low carbon intensity?"

That may generate substantial dynamic-efficiency benefits.

31. CBAM and the Consumer-Welfare Standard

Traditional competition analysis often focuses heavily on:

• price;
• output;
• quality;
• innovation.

Climate regulation introduces another dimension:

environmental quality.

A carbon-intensive product may be cheaper but environmentally more harmful.

Consequently, competition authorities increasingly need to consider whether:

• environmental benefits justify cooperation;
• carbon standards reduce long-term harm;
• green agreements create consumer benefits;
• environmental restrictions unnecessarily suppress competition.

32. Green Agreements and Competition Law

Competitors may cooperate to achieve CBAM compliance.

Examples include agreements to:

• develop common emissions standards;
• share environmental technology;
• establish common certification;
• create low-carbon infrastructure.

Such cooperation can be legitimate.

However, the cooperation must not become a pretext for:

• price fixing;
• market allocation;
• output restriction;
• customer allocation;
• exclusion of competitors.

The central distinction is:

environmental cooperation ≠ immunity from antitrust law.

33. CBAM and International Subsidy Competition

Countries may react to CBAM by subsidising domestic decarbonisation.

This can create a new form of competition:

carbon-adjustment competition + green-subsidy competition.

Countries with greater fiscal capacity may subsidise their industries more aggressively.

That can cause competitive divergence between:

• wealthy economies;
• middle-income economies;
• developing economies.

Consequently, CBAM must be evaluated alongside international subsidy disciplines.

34. Potential Abuse Through Carbon Pricing

Suppose an exporter has already paid a genuine carbon price in its home country.

If the importing country nevertheless charges the full CBAM without adequately recognising the domestic carbon price, the exporter may effectively pay twice.

That creates:

double carbon pricing.

It may also create an artificial competitive disadvantage.

Recognition of equivalent carbon costs is therefore central to competitive neutrality.

35. Competition Effects on Global Investment

CBAM can redirect investment toward countries possessing:

• cheap renewable electricity;
• green hydrogen;
• low-carbon logistics;
• efficient carbon-accounting infrastructure;
• advanced environmental technology.

This could create a global race for low-carbon comparative advantage.

Investment may move away from jurisdictions where production is inexpensive but carbon-intensive.

36. Strategic Competition and Economic Sovereignty

CBAM can also be viewed through the lens of economic sovereignty.

Major economies may use carbon regulation to influence:

• global production standards;
• industrial technology;
• supply chains;
• energy infrastructure;
• foreign investment.

Thus, CBAM is not simply a climate instrument.

It can become an instrument of global economic governance.

37. Key Competition-Law Questions for Future Enforcement

Competition authorities should ask:

Market power

• Who controls low-carbon inputs?
• Who controls carbon certification?
• Who controls emissions data?

Entry

• Do compliance costs exclude SMEs?
• Are verification requirements excessive?

Conduct

• Are dominant firms discriminating between customers?
• Are environmental standards being used to foreclose competitors?

Cooperation

• Is cooperation genuinely necessary for decarbonisation?
• Does it restrict price or output competition?

Mergers

• Are green-technology acquisitions eliminating future competitors?
• Are carbon-data platforms becoming critical infrastructure?

State intervention

• Are subsidies technology-neutral?
• Does domestic support discriminate against foreign competitors?

38. Six Core Legal Principles Emerging From the Case Law

The cases collectively establish several principles relevant to CBAM.

The competition-law cases add a second layer:

39. Ideal Design of a Competition-Neutral CBAM

A competition-neutral CBAM should incorporate:

1. Non-discrimination

Equivalent products should receive equivalent treatment regardless of nationality.

2. Carbon-cost equivalence

Genuine carbon prices already paid abroad should receive appropriate recognition.

3. Transparent methodology

Embedded-emissions calculations should be transparent and predictable.

4. Proportionate compliance

SMEs should not face unnecessarily excessive administrative burdens.

5. Independent verification

Carbon certification should not be controlled by dominant producers.

6. Technology neutrality

The regime should reward lower emissions rather than arbitrarily favouring a particular national technology.

7. Competition safeguards

Carbon compliance should not become a mechanism for cartelisation or exclusion.

8. International cooperation

Common emissions-accounting standards can reduce fragmentation.

40. Overall Legal Assessment

CBAM represents a fundamental transformation in the relationship between environmental regulation and competition law.

Its legitimate economic function is to prevent a situation in which:

foreign producers gain a competitive advantage by operating under materially weaker carbon constraints.

But the mechanism creates several risks:

• disguised protectionism;
• discriminatory market access;
• green industrial subsidies;
• regulatory fragmentation;
• compliance-based entry barriers;
• concentration of carbon-data infrastructure;
• dominance by low-carbon technology providers;
• carbon-standard manipulation;
• retaliatory trade measures; and
• cartel risks arising from environmental information exchange.

The WTO environmental cases—particularly US — Shrimp, EC — Asbestos, Brazil — Retreaded Tyres, China — Raw Materials, India — Solar Cells, and Canada — Renewable Energy—provide the most important legal foundations for evaluating these tensions.

Conclusion

Global Carbon Border Adjustment Mechanisms can either enhance or distort competition depending upon their design.

A well-designed CBAM promotes competitive neutrality by ensuring that domestic and foreign producers internalise comparable carbon costs. It can stimulate innovation, accelerate low-carbon investment and reduce incentives for carbon leakage.

A poorly designed CBAM, however, can become a sophisticated form of green protectionism. It may favour domestic industries, exclude smaller foreign firms, create barriers to entry, encourage subsidy races and give dominant companies control over carbon-data and certification infrastructure.

The emerging legal principle can therefore be expressed as:

Climate ambition does not eliminate competition law or trade-law neutrality; rather, climate regulation must increasingly be designed so that environmental objectives and competitive neutrality operate together.

In the long term, CBAM is likely to transform competition from a contest based principally on price and production efficiency into a contest increasingly based on price + carbon intensity + environmental data + access to low-carbon infrastructure. That makes carbon regulation an increasingly important component of global competition policy.