A 2025 study published in the Proceedings of the National Academy of Sciences found that ingesting less than three sugar-cubes' worth of macroplastic can be lethal to an Atlantic puffin, about two baseballs' worth of macroplastic can be lethal to a sea turtle, and about a soccer ball's worth of macroplastic can be lethal to a seal or dolphin.
November 20, 2025
high
statistical
Quantitative lethal-threshold equivalents for macroplastic ingestion estimated by a 2025 PNAS study.