Comment on "The missing ocean plastic sink: Gone with the rivers".
Lei MaiXiang-Fei SunEddy Y ZengPublished in: Science (New York, N.Y.) (2022)
Weiss et al . (Reports, 2 July 2021, p. 107) incorrectly conclude that the residence time for floating microplastic stock at the ocean surface is ~2.4 years. We contend that this conclusion is fundamentally flawed, because the residence time is obtained through dividing a published oceanic stock of plastic debris by a doubtable river microplastic flux estimated by the authors.