SMRTR Science & EngineeringApr 22, 2025Scientific American

How Plastic, Glass and Paper Move through the Recycling System

SMRTR summary

Single-stream recycling, though convenient, struggles to effectively recycle materials, particularly plastics. Only 9% of U.S.-generated plastic is recycled, with most ending in landfills. The process uses complex sorting systems, but contamination and mixing of incompatible plastics remain problematic. Chemical recycling methods like solvolysis show promise for some plastics, while new compatibilizers may improve mechanical recycling of mixed plastics. Consumers can assist by cleaning items and following local recycling guidelines.

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