Does Subnational Climate Action Trigger a Tipping Point? Catalytic Cascading and Vertical Policy Diffusion in the Net‐Zero Transition
サブナショナルな気候行動は転換点を引き起こすか？ネットゼロ移行における触媒的カスケードと垂直的政策拡散 (AI 翻訳)
Angel Hsu, Diego Manya, Nihit Goyal
🤖 gxceed AI 要約
日本語
本論文は「触媒的カスケード」概念を導入し、サブナショナルなネットゼロ目標宣言が国家レベルの目標採択に与える影響を縦断的データで分析。その結果、人口・GDP・排出量におけるサブナショナルなカバレッジの増加は、国家目標採択確率と正の関連を示し、その効果は段階的かつ累積的であることが明らかになった。
English
This paper introduces 'catalytic cascading' to describe how subnational net-zero commitments affect national target adoption. Using a global dataset, it finds that higher subnational coverage of population, GDP, or emissions is positively associated with national adoption, with effects being gradual and cumulative rather than abrupt.
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
日本でも自治体によるゼロカーボン宣言が増加しており、本知見は国と地方の政策連携の重要性を示唆。SSBJやGX基本方針の策定において、地方の取り組みが国の目標達成に寄与する可能性を裏付ける。
In the global GX context
This study provides empirical evidence for polycentric climate governance theory, showing that subnational actions can trigger national policy adoption. It is relevant for understanding vertical policy diffusion in the context of global net-zero commitments and informs debates on the effectiveness of bottom-up climate initiatives.
👥 読者別の含意
🔬研究者:Offers a novel empirical test of catalytic cascading theory using a dyad-year event history model, advancing understanding of vertical policy diffusion in climate governance.
🏢実務担当者:Highlights the potential for subnational governments to influence national policy, providing a rationale for strengthening local climate action.
🏛政策担当者:Suggests that fostering subnational commitments can be a strategy to accelerate national net-zero adoption, informing policy design and international cooperation.
📄 Abstract（原文）
ABSTRACT Subnational climate commitments are widely viewed as potential catalysts of national climate ambition, yet systematic evidence on whether and under what conditions subnational action shapes national target‐setting remains limited. We introduce the concept of catalytic cascading to describe a cumulative process in which expanding policy commitments change the likelihood of subsequent policy commitment, even at a different jurisdictional level, through reinforcing top‐down, horizontal, and bottom‐up dynamics, without necessarily following an abrupt threshold or tipping behavior. We examine this theory through the lens of vertical policy diffusion, assessing whether subnational net‐zero target declarations are associated with later national net‐zero adoption while accounting for country characteristics and cross‐national peer influences. Using a novel global time‐series dataset of national and subnational net‐zero targets, we estimate discrete‐time adoption models using a directed country‐pair (dyad–time) event history design that incorporates dyad‐specific similarity and exposure measures alongside within‐country subnational coverage. Across specifications, the share of a country's population, GDP, or greenhouse gas emissions covered by subnational net‐zero commitments is positively and statistically significantly associated with the probability of national target adoption. The estimated relationship is gradual and monotonic rather than characterized by a sharp inflection, suggesting that bottom‐up influence operates through cumulative reinforcement rather than threshold acceleration in this setting. These findings provide empirical support for catalytic cascading as an observable bottom‐up linkage within polycentric climate governance and clarify the conditions under which subnational momentum is plausibly consequential for national target‐setting.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.1002/eet.70078first seen 2026-05-14 22:33:29
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