Beyond Operational Emissions: Assessing Ship Recycling as a Decarbonization Pillar for the Global Merchant Fleet
運航排出を超えて：船舶リサイクルをグローバル商船隊の脱炭素化の柱として評価する (AI 翻訳)
Carmen Luisa Vásquez Stanescu, Lucas de Aquino Marinho, Crismeire Isbaex, Luís Rosa, Rodrigo Ramírez-Pisco, Luís Manuel Navas Gracia, Teresa Batista
🤖 gxceed AI 要約
日本語
本研究は、船舶リサイクルを国際海運の脱炭素化における戦略的要素として再定義する。PRISMAに基づく文献レビュー（2019-2025年）により、ばら積み船、コンテナ船、タンカーを分析し、20年超の老朽船の解体がライフサイクル排出量を大幅に削減できることを示した。効果は地域の電力構成に依存し、脱炭素化された電力網のもとでは最大72%の排出削減が可能だが、化石燃料主体では効果が減じる。
English
This study redefines ship recycling as a strategic pillar for maritime decarbonization. Using a PRISMA-based review of literature from 2019-2025, it analyzes bulk carriers, container ships, and tankers, finding that decommissioning up to 22.2% of the global fleet over 20 years old could significantly reduce lifecycle emissions. The mitigation effect is non-linear, ranging up to 72% under deeply decarbonized grids, but is diminished with fossil-heavy energy mixes.
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
日本は主要な海運国であり、船舶リサイクルに関する香港条約や炭素国境調整メカニズムへの対応が迫られている。本論文は、ライフサイクル視点での排出削減の重要性を示し、日本企業のScope 3排出算定やグリーン調達に示唆を与える。
In the global GX context
This paper provides a lifecycle perspective on shipping emissions, complementing TCFD/ISSB disclosure requirements by addressing embodied carbon. It offers an operational roadmap for complying with the Hong Kong Convention and carbon border mechanisms, relevant for global regulators and shipowners.
👥 読者別の含意
🔬研究者:The non-linear emission reduction and regional energy matrix dependency are critical findings for lifecycle assessment models.
🏢実務担当者:Shipowners can use the decommissioning scenarios and steel recovery roadmap to plan fleet renewal and reduce lifecycle emissions.
🏛政策担当者:The paper supports the Hong Kong Convention and carbon border mechanisms by showing the climate benefits of sustainable ship recycling.
📄 Abstract（原文）
Maritime transport contributes 2.9% of global greenhouse gas emissions, traditionally evaluated through operational fuel cycles while neglecting lifecycle impacts. This study redefines merchant ship recycling as a strategic front-end pillar for global decarbonization by assessing Embodied Carbon Trade-offs. Utilizing a mixed PRISMA systematic and semi-systematic methodology of literature from 2019–2025, we analyzed bulk carriers, container ships, and tankers across six thematic clusters. Our findings demonstrate that scenarios involving the potential decommissioning of up to 22.2% of the global merchant fleet exceeding 20 years of age could significantly mitigate lifecycle emissions by displacing primary iron-ore smelting with circular electric arc furnace marine-steel recovery. Crucially, this environmental dividend is non-linear and bound by regional energy matrices; under deeply decarbonized grids, this technological displacement can theoretically yield an upper-bound 72% emissions reduction, whereas fossil-heavy power supplies significantly diminish net mitigation margins. Practically, this research provides an operational roadmap for shipowners and regulators navigating the Hong Kong Convention and carbon border mechanisms. This work concludes that sustainable shipbreaking has the potential to function as an economically viable, strategic reservoir of low-carbon raw materials essential for achieving international net-zero targets throughout the entire shipping structural lifecycle.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.3390/environments13080415first seen 2026-07-24 07:37:00
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