Damages resulting from coastal and riverine flooding in the United States exceed $32 billion annually and cause accelerating societal impacts, with disproportionate disruptions to the lives and livelihoods of vulnerable populations. Two approaches for flood risk mitigation include managed retreat from flood-prone areas, implemented in US buyout programs, and the construction of nature-based solutions (NBS).

The success of many payments for ecosystem services (PES) programs is determined, in large part, by programs’ ability to successfully enroll participants. However, underenrollment remains a frequent challenge and little systematized knowledge about the determinants of participation is available. While case studies of PES programs abound, there is less work suggesting trends or lessons that can inform improvements in PES program design or operation to increase enrollment.

Plastic products are everywhere in daily life in the United States. Yet the economic, environmental and health costs of plastic to society reach up to $1.1 trillion per year—and that’s likely an underestimate.

Prior research suggests that the global financial services sector could influence the sustainability of the ocean economy, particularly with better information on companies’ externalities (Barbier 2023; Sumaila et al. 2021; Jouffray et al. 2019). This brief summarizes preliminary, non-peer-reviewed findings from ongoing research that explores the potential influence of the financial sector on the sustainability of the ocean economy. It aims to contribute to and inform policy discussions emerging from the United Nations Oceans Conference in June 2025.

Nature Portfolio has launched a new collection showcasing small-scale fisheries research conducted by the Illuminating Hidden Harvests (IHH) initiative.

This report empirically examines the determinants of private participation in flood mitigation programs that use a payment for ecosystem services (PES) framework and suggests improved PES program designs and enhancements to their flood mitigation effectiveness. It offers evidence suggesting income from farming and potential participants' past experiences with PES programs may increase participation in programs aiming to mitigate flooding and that in turn could reduce economic damages from flooding impacts.

We provide the first global assessment of the status of preferential access areas (PAAs), a relatively understudied policy tool to govern small-scale fisheries. We find 44 countries, most of them of low or low-middle income, have established a total of 63 PAAs encompassing 3% of continental shelf area worldwide.

The goal of this research is to understand the implications of using nature-based solutions, or natural infrastructure (NI), to mitigate the impacts of flooding. The two solutions I evaluate to supply NI are a program that financially incentivizes its supply by private landowners, and a government-run floodplain property acquisition program. This dissertation consists of three papers examining payments for ecosystem services (PES) programs in terms of enrollment, incentives, and outcomes. 

The United States has increasingly relied on government-administered floodplain buyout programs to reduce flood risk and remove flood-damaged dwellings from floodplains. However, high transaction costs and long administrative timelines dramatically hamper buyout program efficiency. This report derives financial efficiency thresholds suggesting situational advantages to both private- and government-run buyout programs and also evaluates alternative institutional structures for implementing buyouts and novel mechanisms for financing buyouts

In the first annual update of Annual Trends in Plastics Policy, Nicholas Institute researchers find that plastics policy enactment continues to surge and was not negatively affected by the COVID-19 pandemic. To better gauge policy implementation, researchers established a new effectiveness policy library to accompany the 2022 update. These studies indicate that, while underused in existing policy, greater governmental use of economic instruments (e.g., taxes, fees, levies) and information instruments (e.g., awareness campaigns to communicate other instruments to the public, education initiatives, etc.) would aid in enacting effective policies in the future.