The Henderson Island microcosm: plastic pollution accumulation in the South Pacific

A significant reduction in plastic accumulation on Henderson Island, a remote UNESCO World Heritage Site in the South Pacific, was observed following a 2019 cleanup. Annual accumulation rates dropped from 284.75 g/m² (2015–2019) to just 16.8 g/m² (2019–2024), though litter density remains high at 53 items/m², primarily maritime debris. This study leverages decade-long longitudinal data to demonstrate the effectiveness of large-scale cleanups while highlighting persistent pollution challenges. It underscores Henderson Island's role as a microcosm for monitoring oceanic plastic dynamics, emphasizing the need for ongoing community-led efforts, larger sample sizes, and stricter maritime regulations to address lingering debris. Seasonal variability and methodological differences in data collection were also identified as key factors influencing results.

Dijkstra, H. (2025). The Henderson Island microcosm: plastic pollution accumulation in the South Pacific. Marine Pollution Bulletin, 219, 118095. https://doi.org/10.1016/j.marpolbul.2025.118095