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The 1,000 Rivers Contributing The Most To Ocean Plastics by Bob Yirka

A team of researchers affiliated with several institutions in the Netherlands and one in Germany has created a list of the 1000 rivers around the globe that are pouring the most plastics into the world’s oceans. In their paper published in the journal Science Advances, the group describes their study of the factors that introduce plastics into the ocean, and the methods they used to figure out which rivers were the largest contributors. Prior research has shown that an enormous amount of man-made plastic makes its way into the world’s oceans. And many studies have shown the kinds of impacts such plastics can have on the creatures that live in the sea, particularly those exposed to microplastics. In this new effort, the researchers have attempted to find the major sources for plastics in the ocean. To trace the path of plastics from where they are used to the ocean, the researchers looked at possible routes and found three main drivers: wind and various forms of precipitation that move plastics from one area to another; the way land is used and its geography—different types of terrain can make it easier for plastics to be moved by natural forces; and the distance plastics have to travel to get to the sea. Travel distance was found to play a major factor in the likelihood of plastics making it to an ocean. Plastics used near the ocean, for example, or near rivers that run a short distance to the ocean, were found to have a higher probability of making it to the ocean than those more distant from the sea.

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