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Microplastic, which is transported to the oceans via rivers, is an environmental concern. The aim of the study is to gain a better understanding of the export of microplastics from land to sea. The authors developed the Global Riverine Export of Microplastics into Seas (GREMiS) model, a global spatial experimental model for the analysis of the annual export of microplastics to the coastal seas. The results show that the export of microplastics from the rivers varies between regions of the world, with different hotspots, such as Southeast Asia, and depending on the 2050 scenario can be doubled ('Business as usual') or halved as a result of better waste management ('Environmental profits').

The model simulations indicate that worldwide fragmentation of macroplastics is the main source of microplastics. The result strongly depends on the assumed fragmentation rate. Sewage discharges contribute only 20%, ranging from 1% (Africa) to 60% (OECD countries), and will decrease by 2050 as a result of improved sanitation.

The scientists conclude that the control of microplastics in the aquatic environment requires more region-specific research.

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