While diffusion patterns are quite well understood in the context of the Global North, diffusion research has only been applied to a limited extent to investigate how policies spread across developing countries. In this article, we therefore analyze the diffusion patterns of plastic bag bans and plastic bag taxes in the Global South and Global North to contribute to the further refinement of diffusion theory by specifically addressing the under-researched Global South. Moreover, with an in-depth investigation of plastic bag policies through the lens of diffusion research, the article provides insights in the rather new and still underexplored policy field of plastic pollution. We find that industrialized countries have mostly adopted plastic bag taxes, while developing countries have mainly introduced plastic bag bans and thus more stringent legislation than countries in the Global North. So far, the key driving force for the diffusion of plastic bag policies in the Global North has been the global public pressure. In the Global South, where plastic bag litter is much more visible and harmful due to limited waste collection and recycling rates, national problem pressure has been much more influential.

This article assesses innovative climate governance in small-to-medium-sized structurally disadvantaged cities (SDCs) which have remained an under-researched subject area. Considering their deeply ingrained severe economic and social problems it would be reasonable to assume that SDCs act primarily as climate laggards or at best as followers. However, our novel empirical findings show that SDCs are capable of acting as climate pioneers. This article identifies and assesses different types and styles of climate leadership and pioneership and how they play out within multi-level and polycentric governance structures. It concludes that SDCs seem relatively readily willing to adopt transformational climate pioneership styles in the hope of creating 'green' jobs, for example, in the offshore wind energy sector and with the aim of improving their poor external image. However, in order to sustain transformational climate pioneership they often have to rely on support from 'higher' levels of governance. For SDCs there is a tension between learning from each other's best practice and fierce economic competition in climate innovation.

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Few other environmental problems have received as much public attention and criticism in recent years as plastic pollution. Accordingly, in recent years, a number of plastic policies have been adopted at the national and supranational level in the EU and worldwide. In the U.S., health risks were repeatedly raised in the decision-making process of these policies and scholars have pointed out the crucial role of these arguments for the adoption of plastic policies. Hence, this article uses a structuring qualitative content analysis to investigate the parliamentary debates of two recently adopted plastic policies in the EU—namely the EU Plastics Strategy and the Single-Use Plastics Directive—and to assess the relevance of public health and environmental arguments for the EU debate. The analysis reveals broad support for plastics regulation among Members of the European Parliament, who most often use environmental arguments to corroborate their support for the policies in question. In contrast, health concerns do not seem to be crucial for the adoption of plastic policies in the EU.

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