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More than 1000 rivers account for 80% of global riverine plastic emissions into the ocean
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Researchers developed a model to estimate global riverine plastic emissions into the ocean and found that more than 1,000 rivers account for 80% of emissions, rather than just a handful of large rivers as previously assumed. The study suggests that plastic pollution is geographically distributed across many smaller river systems worldwide, which has important implications for developing targeted mitigation strategies.
Plastic waste increasingly accumulates in the marine environment, but data on the distribution and quantification of riverine sources required for development of effective mitigation are limited. Our model approach includes geographically distributed data on plastic waste, land use, wind, precipitation, and rivers and calculates the probability for plastic waste to reach a river and subsequently the ocean. This probabilistic approach highlights regions that are likely to emit plastic into the ocean. We calibrated our model using recent field observations and show that emissions are distributed over more rivers than previously thought by up to two orders of magnitude. We estimate that more than 1000 rivers account for 80% of global annual emissions, which range between 0.8 million and 2.7 million metric tons per year, with small urban rivers among the most polluting. These high-resolution data allow for the focused development of mitigation strategies and technologies to reduce riverine plastic emissions.
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Over 1000 rivers accountable for 80% of global riverine plastic emissions into the ocean
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A new modeling study identified that over 1,000 rivers worldwide account for 80% of all plastic entering the ocean, with the highest-emitting rivers concentrated in Asia and Africa. The model highlights which geographic regions and riverine sources offer the greatest opportunity for reducing ocean plastic pollution.
River plastic emissions to the world’s oceans
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Researchers built a global model to estimate how much plastic waste enters the ocean from rivers, combining data on waste management, population density, and water flow patterns. They estimated that rivers deliver between 1.15 and 2.41 million tonnes of plastic to the oceans annually, with over 74% of emissions occurring between May and October. The top 20 polluting rivers, mostly in Asia, accounted for 67% of the global total, providing key data for targeting cleanup and prevention efforts.
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Researchers developed the MARINA-Plastic model to estimate macro- and microplastic export from over 10,000 river sub-basins worldwide to coastal seas, finding that a small number of rivers in Asia and Africa account for the majority of global plastic inputs to the ocean. The spatially explicit model helps identify where plastic pollution reduction efforts will have the greatest impact.
What can global hydrological models tell us about sources and flows of riverine plastics?
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Researchers used global hydrological models to estimate the sources and flows of riverine plastic pollution entering the ocean from different watersheds worldwide. The models highlighted that plastic delivery is highly variable across regions and is strongly linked to population density and waste management quality. This type of global modeling is essential for prioritizing where plastic waste reduction efforts will have the greatest impact.
Three rivers to the test: Lessons for global plastic transport modelling
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Scientists tracked plastic pollution in three very different rivers around the world and found that most rivers actually trap plastic for long periods rather than quickly flushing it out to sea — meaning previous global estimates of how much plastic reaches our oceans were likely too high by up to 98%. This matters because it shows rivers act as long-term plastic storage sites, which means plastic sitting in waterways near communities may break down into microplastics and contaminate local water and food sources for extended periods, not just pass through on its way to the ocean.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.