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Scaling carbon clubs under CBAM: Incentives and asymmetric burdens

CBAM下での炭素クラブの拡大：インセンティブと非対称な負担 (AI 翻訳)

Xian Hu, Xiang Chen, M. Ho, Jing Cao

Environmental Research Letters📚 査読済 / ジャーナル2026-06-01#炭素価格Origin: Global経営インパクト: 調達リスク対象セクター: cross_sector
DOI: 10.1088/1748-9326/ae756f
原典: https://doi.org/10.1088/1748-9326/ae756f

🤖 gxceed AI 要約

日本語

EUのCBAMが炭素価格付けの国際的連携を促進する可能性を、新たなCarbon Pricing Incentive Index（CPII）と動学的CGEモデルで分析。EU単独では排出削減効果は限定的だが、中国やインドを含む拡大で世界排出量が13.5%削減され、漏出も20%未満に。一方で、中国のGDP損失が1.4%とEUの0.04%に比べ大きく、非対称な負担が参加の障壁となる。

English

This study analyzes whether the EU's CBAM can anchor an expanding carbon pricing coalition using a new Carbon Pricing Incentive Index (CPII) and a dynamic CGE model. Small clubs cut 2040 emissions by under 1.5% with high leakage, while expanding to include China and India cuts global emissions by 13.5% and reduces leakage below 20%. However, asymmetric economic burdens (China's GDP loss 1.4% vs EU's 0.04%) create disincentives for late entrants and fragment global trade.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本はCBAMの直接対象ではないが、炭素価格の国際的整合性が問われる中で、国内のカーボンプライシング設計やGX経済移行債の戦略に示唆を与える。非対称な負担の議論は、日本の産業競争力と国際交渉の観点から重要。

In the global GX context

This paper contributes to global debates on CBAM and carbon club governance, highlighting the trade-offs between climate effectiveness and economic equity. It offers quantitative evidence for policymakers designing international carbon pricing architectures, relevant to ISSB and transition finance discussions.

👥 読者別の含意

🔬研究者:Provides a novel index and CGE framework to quantify club expansion effects, useful for climate-trade research.

🏢実務担当者:Highlights potential trade fragmentation and cost implications for multinational supply chains under CBAM.

🏛政策担当者:Informs design of equitable burden-sharing mechanisms in international carbon pricing coalitions.

📄 Abstract（原文）

Abstract The European Union’s Carbon Border Adjustment Mechanism (CBAM) is the first large-scale climate-trade instrument with the potential to reshape global carbon pricing incentives. Its implementation pressures countries without explicit carbon prices to reconsider their domestic strategies and their positions in emerging climate clubs. Yet it remains unclear whether CBAM can anchor an expanding carbon pricing coalition, and at what environmental, economic, and distributional cost. Here we develop a Carbon Pricing Incentive Index (CPII) – a composite measure of economic capacity, political readiness, and climate vulnerability – to classify countries’ willingness and capacity to price carbon, and integrate it into a dynamic computable general equilibrium model to simulate how different club configurations affect global emissions, economic outcomes, and trade patterns. Small clubs deliver little: an EU-only or leaders-only coalition cuts 2040 emissions by under 1.5% with leakage over 50%. By contrast, expanding to include emerging economies such as China and India is transformative, with global emissions falling by 13.5% and reducing leakage to below 20%. Yet this expansion generates sharply asymmetric economic burdens. China faces a 1.4% GDP loss upon entry, compared with only 0.04% for the EU – an economic penalty that creates strong disincentives for late entrants. Broader membership also fragments global trade, as commerce is redirected away from non-members and toward club members, thereby hardening new economic blocs. These dynamics highlight the dual nature of carbon clubs: they can accelerate decarbonization but also fracture global trade. The central challenge is therefore not merely technical efficiency, but designing governance that ensures equitable burden-sharing and manages fragmentation.

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