Over the past decades, the international governance of climate change has evolved from a singular forum—the UNFCCC—to a larger international regime complex of a variety of fora covering different aspects of the broader climate change issue. The international regime complex on climate change (IRCCC) presents particular challenges and opportunities for ambitious climate actors like the European Union. However, it remains unclear how much importance the EU has attributed to the non-UNFCCC fora of the complex over time and whether the EU is responsive in its climate diplomacy to the evolving international governance structure. This paper therefore addresses the question: To what extent has the importance that the EU has placed on non-UNFCCC fora coincided with the evolution of the international regime complex on climate change? Using qualitative coding of Council Conclusions related to multilateral climate diplomacy (1994–2018), the article finds that the EU is indeed responsive, though to varying degrees, to the evolution of the IRCCC. Additionally, the EU has been more responsive to fora in certain policy areas than others, though the extent this importance is reciprocated beyond the UNFCCC context is called into question. This article therefore provides an updated perspective of not only the importance of non-UNFCCC fora to EU climate diplomacy but also in the IRCCC more broadly.

在过去的几十年里，气候变化的国际治理已经从一个单一的论坛——联合国气候变化框架公约——演变为一个更大的国际制度复合体，涵盖了更广泛的气候变化问题的不同方面的各种论坛。国际气候变化体制综合体 (IRCCC) 为欧盟等雄心勃勃的气候行动者带来了特殊的挑战和机遇。然而，随着时间的推移，欧盟对该综合体的非 UNFCCC 论坛的重视程度以及欧盟是否在其气候外交中对不断变化的国际治理结构做出回应，仍不清楚。因此，本文解决了这个问题：欧盟对非 UNFCCC 论坛的重视在多大程度上与气候变化国际体系的演变相吻合？使用与多边气候外交（1994-2018 年）相关的理事会结论的定性编码，文章发现欧盟确实对 IRCCC 的演变做出了反应，尽管程度不同。此外，与其他政策领域相比，欧盟对某些政策领域的论坛反应更迅速，尽管这种重要性在 UNFCCC 范围之外的回报程度受到质疑。因此，本文不仅提供了非 UNFCCC 论坛对欧盟气候外交以及更广泛的 IRCCC 的重要性的最新视角。