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Reply to Comment on ‘National temperature neutrality, agricultural methane and climate policy: reinforcing inequality in the global food system’

『国家の温度中立性、農業メタン、気候政策：地球食料システムにおける不平等の強化』へのコメントに対する返信 (AI 翻訳)

Colm Duffy, Carl Doedens, R. Moriarty, Hannah Daly, David Styles, Malte Meinshausen

Environmental Research Letters📚 査読済 / ジャーナル2026-04-14#政策Origin: Global
DOI: 10.1088/1748-9326/ae53fc
原典: https://doi.org/10.1088/1748-9326/ae53fc

🤖 gxceed AI 要約

日本語

本論文は、国家レベルの「温度中立性（TN）」を気候政策の基礎とすることへの批判に応答する。TNはEUやパリ協定の枠組みと両立せず、各国がTNを採用すると緩和ギャップが拡大する「底辺への競争」を生むと論じる。また、TNはアイルランドの農業メタン排出を不当に温存し、食料安全保障の弱い発展途上国から排出余地を奪うと指摘する。GWP100の科学的厳密性を擁護し、TNよりも優れた基準であると結論付ける。

English

This paper responds to commentary defending national temperature neutrality (TN) as climate policy. It shows TN is incompatible with EU and Paris Agreement frameworks and would create a 'race to the bottom' in mitigation. The authors argue TN grandfathers high per-capita agricultural methane emissions in Ireland, appropriating emissions space from food-insecure developing countries. They defend GWP100 as a scientifically rigorous and internationally standardised metric, concluding TN is not an effective or fair policy basis.

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

本論文はアイルランドを事例とするが、日本の農業 methane 対策や気候政策の公平性議論にも示唆を与える。特に、SSBJや有価証券報告書における排出量評価手法（GWP100 vs 温度寄与）の選択に影響しうる。ただし、直接的な日本関連性は限定的。

In the global GX context

This paper contributes to the global debate on climate policy metrics, contrasting temperature neutrality with net-zero frameworks. It raises critical equity and effectiveness concerns relevant to international negotiations and national policy design under the Paris Agreement, particularly for agricultural emissions. The 'race to the bottom' argument is a novel warning for global mitigation cooperation.

👥 読者別の含意

🔬研究者:Highlights the pitfalls of temperature neutrality as a policy metric and provides arguments for retaining GWP100 in carbon accounting.

🏢実務担当者:May inform corporate sustainability teams on the implications of different emission metrics for agriculture and land sector targets.

🏛政策担当者:Offers evidence against adopting temperature neutrality in national climate plans, emphasizing incompatibility with EU and Paris frameworks.

📄 Abstract（原文）

Abstract This paper responds to a comment on our study of national “temperature neutrality” (TN) as a basis for climate policy, using Ireland as a case study. The comment mischaracterises our original analysis in several respects; we correct these mischaracterisations and engage with the substantive arguments raised. We demonstrate that the comment constructs a false dichotomy between national TN and net-zero greenhouse gas emissions (NZ-GHG), overlooking the split-gas compromise pathways explicitly evaluated in our original study. In addition, the EU effort-sharing framework is based on absolute GHG emissions reductions, not temperature contributions, and Ireland’s obligations under Regulation (EU) 2018/842 and the Paris Agreement require economy-wide absolute reductions. A national TN approach is therefore incompatible with these existing frameworks. We further show that widespread adoption of national TN would create a proliferation dynamic, a “race to the bottom”, in which the mitigation gap left by TN-adopting states increases pressure on remaining states, collectively undermining the EU and global mitigation effort. We also rebut the assertion that GWP100 lacks scientific rigour: it is grounded in the same physical climate modelling as TN-based approaches and benefits from a standardised, internationally accepted accounting protocol. Finally, we highlight the equity implications identified in our original study: national TN grandfathers disproportionately high per-capita agricultural CH 4 emissions in Ireland, appropriating emissions space needed by food-insecure developing countries. We conclude that TN is not an effective, fair, transparent, or robust basis for national climate policy.

🔗 Provenance — このレコードを発見したソース

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