The Greenhouse Gas Footprint of LNG Pathways From Major Exporters
主要輸出業者からのLNG経路の温室効果ガス排出量 (AI 翻訳)
Aiman Albatayneh, Mohammad Khwaileh
🤖 gxceed AI 要約
日本語
本研究は5大LNG輸出国（米国、カタール、アルジェリア、ロシア、オーストラリア）から欧州市場およびアジア市場へのLNG発電経路のライフサイクルアセスメントを実施。GWP20を用い、メタン漏洩率（0.2%～4.5%）の違いが排出量に大きな影響を与えることを示した。高漏洩条件下の米国LNGは石炭と同等以上の排出量となる。
English
This study conducts a cradle-to-grave LCA of LNG-to-electricity pathways from five major exporters (US, Qatar, Algeria, Russia, Australia) to European and Asian markets, using GWP20. It finds that only low-leakage LNG (0.2%) offers a clear climate advantage over coal, while high-leakage US LNG can match or exceed coal emissions.
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LNG輸入大国であり、本結果は調達先のメタン漏洩率を考慮したLNG選定の重要性を示す。SSBJやTCFDの開示において、Scope3排出量算定の精緻化に貢献しうる。
In the global GX context
Global LNG trade is often framed as a bridge fuel, but this paper shows route-specific methane leakage is critical. It challenges uniform GWP100 assumptions and supports ISSB/TCFD-aligned disclosure of methane emissions.
👥 読者別の含意
🔬研究者:Provides a comparative LCA methodology using GWP20 for LNG pathways, highlighting the importance of methane leakage data granularity.
🏢実務担当者:Can inform procurement decisions by comparing emissions across LNG suppliers and routes, helping meet corporate decarbonization targets.
🏛政策担当者:Supports the case for methane regulations and route-specific emissions benchmarks in LNG trade agreements.
📄 Abstract（原文）
Liquefied natural gas (LNG) is often promoted as a cleaner alternative to coal, yet its climate advantage remains highly conditional. Existing literature frequently underestimates LNG’s short‐term climate impact by assuming uniformly low methane leakage and focusing on 100‐year global warming potential (GWP 100 ) metrics. This study addresses this gap by conducting a comparative cradle‐to‐grave life cycle assessment (LCA) of LNG‐to‐electricity pathways from five major exporters—the United States, Qatar, Algeria, Russia, and Australia—to European and Asian markets. The functional unit is 1 MWh of net electricity generated in modern combined‐cycle gas turbines (CCGTs), with results expressed in kg carbon dioxide (CO 2) e/MWh using the 20‐year GWP (GWP 20 , IPCC AR6). Emissions estimates are instantaneous per‐unit‐generation values, not time‐averaged. The analysis integrates country‐ and route‐specific methane leakage rates (0.2%–4.5%), liquefaction energy intensity, shipping distances, regasification configurations, and combustion performance. Results show significant variability: Qatar LNG has the lowest emissions (450–600 kg CO 2 e/MWh), followed by Algeria (530–570), Australia, and Russia (650–770), while U.S. LNG under high‐leakage conditions reaches 1050–1100 kg CO 2 e/MWh, comparable to or exceeding subcritical coal. The findings demonstrate that only low‐leakage LNG routes offer a meaningful emissions advantage over coal, underscoring the need for methane mitigation and route‐specific assessment in aligning LNG trade with near‐term decarbonization targets.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1155/er/8861256first seen 2026-06-29 06:22:37
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