Stopping Plastic at the Source Alone Cannot Save the Ocean from

A new modeling study challenges the idea that simply stopping new plastic from entering the ocean will be enough to “let nature clear the drain.” Researchers from Japan, France, and the Netherlands—led by Ritsumeikan University’s Prof. Takuro Uehara, with Dr. Mateo Cordier and Laurent Lebreton of The Ocean Cleanup—published their findings in Communications Earth & Environment on September 12, 2026. Even if all marine plastic inputs are halted by 2050, plastic already at sea will keep fragmenting into microplastics, which large-scale recovery systems can’t capture efficiently. Using a system dynamics model, the team simulated transport, degradation, and cleanup across shorelines, coastal waters, and offshore zones, highlighting that timing and location determine cost and feasibility.