Microplastic contamination has permeated virtually all ecosystems, with growing evidence of welfare harms to wild animals through ingestion, entanglement, and chemical exposure.
Microplastic contamination represents a diffuse but enormous welfare harm to wild animals globally. Affected animals eat less, grow more slowly, reproduce less successfully, and experience internal physical damage from ingested particles. The chemicals leached from plastics cause hormonal disruption that impairs behavior and physiology. Unlike acute pollution events, microplastic harm is chronic, cumulative, and currently irreversible at ecosystem scale.