The negotiations for a new treaty to govern the ‘full lifecycle’ of plastics face a major challenge: designing a strong treaty, quickly, that is acceptable to most of the international community of states. Although diplomats play a critical role in accomplishing this task, scholars and researchers represent a critical network of support, especially on the topic of treaty design. This article outlines a research agenda focused on the new treaty as part of a larger ‘regime complex,’ where the interfaces between the new treaty and existing agreements will strongly shape its efficacy, efficiency, and acceptance by states. It also begins to pursue this research agenda, by investigating the relationship between the ocean governance regime, especially the United Nations Convention on the Law of the Sea, and the emerging plastics treaty. The article illustrates that the ocean governance regime offers important normative foundations, institutional models, lessons about treaty language, and possibilities for institutional linkage that can inform the design of the plastics treaty. It concludes by identifying several other avenues of useful research on the nascent plastics regime complex.

What type of trade agreement is the public willing to accept? Instead of focusing on individual concerns about market access and trade barriers, we argue that specific treaty design and, in particular, the characteristics of the dispute settlement mechanism, play a critical role in shaping public support for trade agreements. To examine this theoretical expectation, we conduct a conjoint experiment that varies diverse treaty-design elements and estimate preferences over multiple dimensions of the Transatlantic Trade and Investment Partnership (TTIP) based on a nationally representative sample in Germany. We find that compared to other alternatives, private arbitration, known as investor-state dispute settlement (ISDS), generates strong opposition to the trade agreement. As the single most important factor, this effect of dispute settlement characteristic is strikingly large and consistent across individuals’ key attributes, including skill levels, information, and national sentiment, among others.