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River export of macro- and microplastics to seas by sources worldwide
Summary
This global modeling study estimated that rivers carry about 500,000 tons of plastic into the ocean each year, with both large plastics and microplastics playing significant roles. In Europe, North America, and Oceania, microplastics from sewage are the dominant type in nearly 40 percent of river basins, while in Africa and Asia, larger plastic waste from poor waste management is the main problem. The study helps identify which areas need which types of pollution reduction strategies to protect both marine ecosystems and the communities that rely on them.
Seas are polluted with macro- (>5 mm) and microplastics (<5 mm). However, few studies account for both types when modeling water quality, thus limiting our understanding of the origin (e.g., basins) and sources of plastics. In this work, we model riverine macro- and microplastic exports to seas to identify their main sources in over ten thousand basins. We estimate that rivers export approximately 0.5 million tons of plastics per year worldwide. Microplastics are dominant in almost 40% of the basins in Europe, North America and Oceania, because of sewage effluents. Approximately 80% of the global population live in river basins where macroplastics are dominant because of mismanaged solid waste. These basins include many African and Asian rivers. In 10% of the basins, macro- and microplastics in seas (as mass) are equally important because of high sewage effluents and mismanaged solid waste production. Our results could be useful to prioritize reduction policies for plastics.