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Reducing Methane Emissions Along Global Natural Gas Supply Chain through Import Standards

輸入基準による天然ガスサプライチェーン全体のメタン排出削減 (AI 翻訳)

Ryna Yiyun Cui, Jiaxun Sun, Xinzhao Cheng, Rachel Hoesly, Julie Miller, Andy Miller, Xiaopu Sun, Brinda Yarlagadda, Christoph Bertram, Gabrielle Dreyfus, Richard Ferris, Nathan Hultman, Steven Smith, Mengye Zhu

プレプリント2026-08-13#政策Origin: US経営インパクト: 調達リスク対象セクター: energy
DOI: 10.21203/rs.3.rs-10476216/v1
原典: https://doi.org/10.21203/rs.3.rs-10476216/v1

🤖 gxceed AI 要約

日本語

本研究は、天然ガスの国際貿易におけるメタン排出削減のための輸入基準の有効性を、全球統合評価モデル（GCAM）を用いて評価した。主要輸入国が基準を導入すると、2035年にはサプライチェーン排出量が58%削減されるが、世界全体では30%にとどまり、排出漏れが生じる。エネルギー転換や生産国側の対策と組み合わせることで、より深い削減が可能となる。

English

This study evaluates the effectiveness of methane-intensity import standards for natural gas using a global integrated assessment model (GCAM). It finds that import standards can reduce supply-chain emissions by 58% for major importers by 2035, but global reductions are only 30% due to emissions leakage. Combining standards with accelerated energy transition or producer-side abatement achieves deeper reductions.

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

日本は天然ガス輸入大国であり、輸入基準の導入はエネルギー安全保障と排出削減の両面で重要。SSBJ開示やサプライチェーン排出管理の文脈で、輸入先のメタン排出強度を考慮する必要性を示唆する。

In the global GX context

This study provides quantitative evidence on how import standards can reduce methane emissions in global gas trade, relevant for EU and US methane regulations and for companies facing supply-chain disclosure requirements under CSRD and ISSB.

👥 読者別の含意

🔬研究者:Provides a modeling framework for assessing trade-based climate policies and emissions leakage.

🏢実務担当者:Highlights the importance of methane intensity in gas procurement and potential future import standards.

🏛政策担当者:Informs design of import standards and complementary measures to avoid emissions leakage.

📄 Abstract（原文）

Abstract Rapidly reducing energy sector methane (CH₄) emissions is the most critical mitigation strategy to limit near-term warming. As natural gas (NG) increasingly trades across supply chains, policy measures such as methane-intensity-based import standards can tackle upstream emissions that fall outside importers’ domestic regulation authorities. Using a global integrated assessment model (GCAM-v8.2-CGS) with explicit representation of bilateral pipeline and LNG trade flows and improved representation of regional methane emissions across the supply chain, this study assesses the effectiveness of import standards under alternative energy transition, trade, and CH₄ mitigation scenarios. We find that import standards can reduce CH₄ emissions along the NG supply chain for major importers by 58% in 2035 and by 64% in 2060 from the reference by shifting from high-intensity to low-intensity NG suppliers. However, global reductions only reach 30% because high-intensity supply is redirected to unconstrained markets. Combining import standards with either accelerated energy transition under net-zero targets or broader producer-side methane abatement helps reduce emissions leakage to achieve deeper and sustained global reductions.

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