二重排出会計の下での国別炭素予算とネットゼロ目標
National Carbon Budgets and Net-Zero Targets under Dual Emissions Accounting (原題)
Morfeldt J, Johansson D, Azar C
🤖 gxceed AI 要約
日本語
領域ベース排出と消費ベース排出を併用する「二重会計」の下で、91カ国+EUの国別炭素予算とネットゼロ達成年を試算した研究。緩和野心は努力分担アプローチだけでなく、領域排出と消費排出に与える責任配分のウェイトにも敏感に反応する。貿易に伴う純排出が歴史的に大きい国ほど影響が強く、このウェイトは実証的に決められない本質的に規範的な要素だと指摘する。
English
This study derives national carbon budgets and implied net-zero years for 91 countries plus the EU under a dual accounting framework covering both territorial and consumption-based emissions. Mitigation ambition proves sensitive not only to the effort-sharing approach but also to the weight assigned to territorial versus consumption-based emissions. The effect is strongest for countries with historically large net emissions embodied in trade, and this weight is inherently normative rather than empirically determinable.
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
SSBJ・有報でのScope3開示やカーボンニュートラル目標の妥当性検証に関わる論点を提供する。消費ベース会計の責任配分は、日本企業のサプライチェーン排出管理や国別目標の説明責任を考える上で示唆に富む。
In the global GX context
Speaks directly to the ISSB/CSRD debate on whether consumption-based (Scope 3-adjacent) accounting should complement territorial inventories. It highlights that responsibility allocation between the two is a normative choice, relevant to national net-zero target design and transition-finance credibility.
👥 読者別の含意
🔬研究者:二重会計が国別緩和野心評価に与える感度と規範的ウェイトの重要性を示す実証枠組みを提供する。
🏢実務担当者:Scope3を含む排出責任配分の議論が、自社のサプライチェーン排出目標や開示の前提に影響しうる点を理解する材料になる。
🏛政策担当者:国別ネットゼロ目標や炭素予算の設計において、領域・消費両会計のウェイト設定が本質的に規範的選択であることを政策立案時に考慮すべき。
📄 Abstract(原文)
<title>Abstract</title> <p>Consumption-based and territorial emissions accounting could operate side by side, as has been proposed by a few countries. However, how such dual accounting affects assessments of national mitigation ambition remains unclear. Here, we derive national carbon budgets and implied net-zero emission years under hypothetical net-zero targets that cover both territorial and consumption-based emissions within a dual accounting framework. We apply three effort-sharing approaches for 91 countries plus the European Union. Our results show that the derived national mitigation ambitions are sensitive not only to the effort-sharing approach used but also to the weight given to territorial versus consumption-based emissions when assigning responsibility to individual countries. The impact is strongest for countries with historically large net emissions embodied in trade. Under a dual accounting framework, the weight given to territorial versus consumption-based emissions when assigning responsibility to individual countries cannot be determined empirically and constitutes another inherently normative component.</p>
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.21203/rs.3.rs-11009726/v1first seen 2026-10-02 04:20:50
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gxceed は公開メタデータに基づく研究支援データセットです。要約・翻訳・解説は AI 支援で生成されています。 最終的な解釈・検証は利用者が原典資料に基づいて行うことを前提とします。