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海運脱炭素化における規制重複のナビゲーション：EU海運ETSとIMOネットゼロ枠組みの調整

Navigating regulatory overlap in shipping decarbonization: coordinating the EU Maritime ETS and the IMO Net-Zero Framework (原題)

Gaoxin Guo, Peng Wang

Frontiers in Marine Science📚 査読済 / ジャーナル2026-08-18#政策Origin: CN経営インパクト: 調達リスク対象セクター: transport
DOI: 10.3389/fmars.2026.1910244
原典: https://doi.org/10.3389/fmars.2026.1910244

🤖 gxceed AI 要約

日本語

国際海運の脱炭素化において、EU海運ETSとIMOネットゼロ枠組みの並行発展による規制重複を分析。規範的・コスト的・手続き的重複の3形態を特定し、地域・多国間レベルの2層調整経路を提案。EUの触媒的役割の限界とIMOの中心的役割の条件を論じる。

English

This article analyzes regulatory overlap between the EU Maritime ETS and the IMO Net-Zero Framework in international shipping decarbonization. It identifies normative, cost, and procedural overlaps, and proposes a two-level coordination pathway: repositioning the EU ETS as a transitional mechanism and strengthening the IMO framework as a multilateral anchor, with managed coexistence as a fallback.

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

日本は海運大国であり、外航海運の脱炭素規制対応は喫緊の課題。EU-ETSとIMO枠組みの調整は、日本船社のコンプライアンス戦略や国際交渉に直結する。また、SSBJ開示やトランジション・ファイナンスの文脈でも、海運セクターの排出量算定・報告の整合性が求められる。

In the global GX context

This paper addresses a critical global governance gap as regional and international shipping carbon regimes overlap. It offers a framework for coordinating the EU ETS and IMO Net-Zero Framework, relevant to policymakers, shipping companies, and investors navigating compliance and transition finance. The analysis contributes to debates on regulatory fragmentation and multilateral coordination in climate governance.

👥 読者別の含意

🔬研究者:Provides a taxonomy of regulatory overlaps and a coordination framework for overlapping climate regimes.

🏢実務担当者:Highlights compliance risks and strategic considerations for shipping companies facing dual EU and IMO obligations.

🏛政策担当者:Offers concrete coordination pathways and institutional conditions for aligning regional and global shipping carbon regimes.

📄 Abstract（原文）

The decarbonization of international shipping is entering a transitional phase in which a regional regime and an emerging global framework are developing in parallel. Since 2024, shipping companies have been subject to phased compliance obligations under the European Union (EU) Maritime Emissions Trading System (ETS), while the International Maritime Organization (IMO) Net-Zero Framework, approved at the Marine Environment Protection Committee 83 in April 2025, has faced delayed adoption and implementation. This sequencing creates a regulatory window in which the EU regime operates ahead of the prospective global framework. Once the IMO mechanism enters into force, the same voyage, vessel, and reporting year may fall within both regimes. This article examines the resulting regulatory overlap between the EU Maritime ETS and the IMO Net-Zero Framework. The article identifies three forms of overlap. Normative overlap arises from the coexistence of port-linked EU regulation and ship-based global compliance. Cost overlap results from the combined operation of allowance surrender and greenhouse gas fuel intensity compliance. Procedural overlap stems from separate reporting, verification, and registry systems. It argues that uncoordinated coexistence may fragment multilateral governance, distribute decarbonization burdens unevenly, and increase compliance uncertainty for regulated actors. To address these risks, this article proposes a two-level coordination pathway at the regional and multilateral levels. At the regional level, the EU Maritime ETS has functioned as a catalyst for multilateral action, though its catalytic effect has fundamental limits. It may be repositioned as a transitional mechanism through jurisdictional self-restraint, crediting arrangements, and data interfaces. At the multilateral level, the IMO framework may serve as the central multilateral anchor. For it to do so credibly, a set of internal institutional conditions may need to be met, covering revenue predictability, binding allocation rules, accounting standards capable of alignment with the EU ETS, monitoring, reporting, and verification procedures that allow recognition of verified data, and effective compliance monitoring. Where these conditions are not met, coordination would be confined to managed coexistence, with the EU regime continuing as an autonomous backstop.

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