Kerstin Martens

Recent challenges to the liberal international order ( LIO ) have called into question the efficacy of international organizations ( IO s) in global governance. However, it remains unclear if the anticipated crisis of the LIO affects all policy fields to the same degree. Based on organizational ecology, this article seeks to explain compositions and trajectories across three fields—climate, education, and health. It shows that the three subpopulations of IO s are stable since the early 2000s, while regional IO s constitute a significant share of the subpopulations. It further finds notable variation in the distribution of generalist and specialist IO s. While the number of generalist IO s in relation to specialist health IO s decreased over time, the article finds generalist education and climate IO s have been on the rise. It argues that—as policy issues grow ever more interconnected over time— IO s expand their thematic scopes to new niches.