Plastic Pollution in the World's Oceans: More than 5 Trillion Plastic Pieces Weighing over 250,000 Tons Afloat at Sea

Plastic Pollution in the World's Oceans: More than 5 Trillion Plastic Pieces Weighing over 250,000 Tons Afloat at Sea Marcus Eriksen Laurent Lebreton Henry S. Carson Martín Thiel Charles J. Moore Jose C. Borerro François Galgani Peter G. Ryan Júlia Reisser

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Plastic Pollution in the World's Oceans: More than 5 Trillion Plastic Pieces Weighing over 250,000 Tons Afloat at Sea 2014 PLoS ONE 10.1371/journal.pone.0111913 eriksen2014-plastic-pollution-in-the-world-s-o eriksen2014-plastic-pollution-in-the-world-s-o.txt, the project's staged copy 0ac216928e0ce025602e1ef46de6ba8bd87e2510 cc-by environmental-science

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0 spans located by searching the stored text for the quote's exact words, allowing any whitespace between them the count and weight of plastic particles floating at the surface of the world's oceans, in four size classes Quotation withheld because this record is not cleared for redistribution. how much plastic is afloat in the world's oceans, and whether the size distribution matches what fragmentation of larger items predicts Quotation withheld because this record is not cleared for redistribution. a global estimate across all four size classes - at least 5.25 trillion particles weighing 268,940 tons - and the finding that microplastics are an order of magnitude scarcer than fragmentation predicts Quotation withheld because this record is not cleared for redistribution. existence Quotation withheld because this record is not cleared for redistribution. differential loss of small microplastics from the sea surface Quotation withheld because this record is not cleared for redistribution. field-study field-study Quotation withheld because this record is not cleared for redistribution. UV degradation, biodegradation, ingestion by organisms, loss of buoyancy from fouling, entrainment in settling detritus and beaching all take small particles out of the sampled layer removal from the sea surface Quotation withheld because this record is not cleared for redistribution. brittle microplastics may break down faster than they are replaced, into particles smaller than the 0.33 mm mesh, so they leave the measurement rather than the ocean fragmentation below the mesh Quotation withheld because this record is not cleared for redistribution. as a particle shrinks its surface-area-to-volume ratio rises sharply and oxidation increases, so microbial degradation accelerates at exactly the sizes that are missing size-dependent biodegradation Quotation withheld because this record is not cleared for redistribution. the fragmentation accounting assumes the system is near equilibrium, and inputs and outputs of ocean plastic are unknown Quotation withheld because this record is not cleared for redistribution. the estimates are conservative and should be read as minima; macroplastic rests on a limited inventory of observations Quotation withheld because this record is not cleared for redistribution. plastic on shorelines, on the seabed, in the water column and inside organisms is not counted at all Quotation withheld because this record is not cleared for redistribution. where the missing plastic goes is left open - the paper closes on the question rather than an answer Quotation withheld because this record is not cleared for redistribution. the surface-area-to-volume argument, taken from microbial ecology to explain why the smallest particles vanish fastest Quotation withheld because this record is not cleared for redistribution. conservative weights assigned to the two catch-all visual-survey categories eliminates: an unweighted catch-all category dominating a global mass estimate through the items nobody could identify · outcome: held Quotation withheld because this record is not cleared for redistribution. fragmentation parameters chosen so the predicted particle counts are under-stated rather than over-stated eliminates: a fragmentation model tuned until it produced the particle count the survey found - the bias is set to under-state on purpose, so agreement cannot be manufactured · outcome: held Quotation withheld because this record is not cleared for redistribution. correction for wind-driven vertical mixing carrying particles below the sampled layer eliminates: surface sampling being read as total abundance when wind drives particles below the sampled layer · outcome: held Quotation withheld because this record is not cleared for redistribution. the global microplastic estimate checked against two independent published estimates eliminates: a global estimate resting on one team's method with no independent magnitude to check it against · outcome: held Quotation withheld because this record is not cleared for redistribution. an accounting of plastic on shorelines, on the seabed, in the water column and within organisms eliminates: plastic that is not floating at the surface - shorelines, seabed, water column and organisms are outside the estimate, so the total is a count of one compartment presented against a question about the ocean · outcome: absent-declared-unreported Quotation withheld because this record is not cleared for redistribution. microplastic microplastic Quotation withheld because this record is not cleared for redistribution. mesoplastic mesoplastic Quotation withheld because this record is not cleared for redistribution. Macroplastic Macroplastic Quotation withheld because this record is not cleared for redistribution. neuston net neuston net Quotation withheld because this record is not cleared for redistribution. fragmentation fragmentation Quotation withheld because this record is not cleared for redistribution. vertical distribution vertical distribution Quotation withheld because this record is not cleared for redistribution. ultimate sink ultimate sink Quotation withheld because this record is not cleared for redistribution. sea surface sea surface Quotation withheld because this record is not cleared for redistribution. the prefixes micro, meso and macro are POORLY DEFINED in this field - stated by the authors Quotation withheld because this record is not cleared for redistribution. microplastic upper bound = 4.75 mm BECAUSE IT IS A STANDARD SIEVE SIZE, not a property of plastic Quotation withheld because this record is not cleared for redistribution. mesoplastic upper bound = 200 mm BECAUSE THAT IS A TYPICAL PLASTIC WATER BOTTLE Quotation withheld because this record is not cleared for redistribution. macroplastic lower bound = 200 mm, set by this paper because the field has no established one Quotation withheld because this record is not cleared for redistribution. the boundaries are LOGISTIC rather than conceptual - net and sieve sizes - and are declared as such Quotation withheld because this record is not cleared for redistribution. the field's generally accepted lower bound, 0.33 mm, is a neuston net's mesh opening Quotation withheld because this record is not cleared for redistribution. claim_type: existence a second reading reaching the same value. Recorded: existence — note: A BLIND second reading by the project on 2026-08-25: the record's own claim type/method/phenomenon were not looked at until every value here was written and substring-verified. Not applied - a person decides. Sampling frame: the 504 staged records carrying no alternatives block, so this never re-measures the 202. All 11 records with 130+ tags were taken as a census and 19 more spread one per discipline across 22 disciplines - the dense non-neuroscience cell is the one the 202 do not contain (inside them, 94-100% of the densest bands are neuroscience; among these 11, one is)., Quotation withheld because this record is not cleared for redistribution. method: field-survey a second reading DIFFERING from the recorded value. Recorded: field-study — note: A BLIND second reading by the project on 2026-08-25: the record's own claim type/method/phenomenon were not looked at until every value here was written and substring-verified. Not applied - a person decides. Sampling frame: the 504 staged records carrying no alternatives block, so this never re-measures the 202. All 11 records with 130+ tags were taken as a census and 19 more spread one per discipline across 22 disciplines - the dense non-neuroscience cell is the one the 202 do not contain (inside them, 94-100% of the densest bands are neuroscience; among these 11, one is)., Quotation withheld because this record is not cleared for redistribution. phenomenon: the abundance and total weight of plastic floating in the world's oceans a second reading DIFFERING from the recorded value. Recorded: differential loss of small microplastics from the sea surface — note: A BLIND second reading by the project on 2026-08-25: the record's own claim type/method/phenomenon were not looked at until every value here was written and substring-verified. Not applied - a person decides. Sampling frame: the 504 staged records carrying no alternatives block, so this never re-measures the 202. All 11 records with 130+ tags were taken as a census and 19 more spread one per discipline across 22 disciplines - the dense non-neuroscience cell is the one the 202 do not contain (inside them, 94-100% of the densest bands are neuroscience; among these 11, one is)., Quotation withheld because this record is not cleared for redistribution. confirms → an independent study reporting a large discrepancy between expected and observed microplastic note: the agreement is used as support for the hypothesis, not merely as a consistency check Quotation withheld because this record is not cleared for redistribution. mesoplastic —distinct-from→ Macroplastic mesoplastic Macroplastic differs in: the 200 mm boundary, chosen as a typical plastic water bottle · strength of the relation: 0.95 Quotation withheld because this record is not cleared for redistribution. fragmentation —causes→ microplastic fragmentation microplastic direction on the measure: increases · strength of the relation: 0.95 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span writes 'fragments resulting from the breakdown of larger plastic items', not 'fragmentation'. Quotation withheld because this record is not cleared for redistribution. microplastics are an order of magnitude scarcer than conservative fragmentation estimates predict Quotation withheld because this record is not cleared for redistribution. the smallest microplastics are LESS abundant than larger ones, the opposite of what fragmentation implies, in every region but the South Pacific Quotation withheld because this record is not cleared for redistribution. the sea surface is likely not the ultimate sink for ocean plastic Quotation withheld because this record is not cleared for redistribution. microplastic microplastic Quotation withheld because this record is not cleared for redistribution. Mesoplastic Mesoplastic Quotation withheld because this record is not cleared for redistribution. Macroplastic Macroplastic Quotation withheld because this record is not cleared for redistribution. at least 5.25 trillion plastic particles weighing 268,940 tons afloat — None Quotation withheld because this record is not cleared for redistribution. 75.4% macroplastic, 11.4% mesoplastic, 10.6% and 2.6% in the two microplastic classes, by weight — None Quotation withheld because this record is not cleared for redistribution. 233,400 tons of larger items against 35,540 tons of microplastics — None Quotation withheld because this record is not cleared for redistribution. 288 million tons of plastic produced worldwide in 2012; the floating estimate is 0.1% of it — None Quotation withheld because this record is not cleared for redistribution. 4.75 mm, the microplastic upper boundary, taken from standard sieve sizes — None Quotation withheld because this record is not cleared for redistribution. 0.33 mm, the field's lower boundary, taken from neuston net mesh — None Quotation withheld because this record is not cleared for redistribution. an order of magnitude between expected and data-calibrated microplastic counts an order of magnitude between expected and data-calibrated microplastic counts Quotation withheld because this record is not cleared for redistribution. same order of magnitude agreement with independent estimates same order of magnitude agreement with independent estimates Quotation withheld because this record is not cleared for redistribution. weight weight Quotation withheld because this record is not cleared for redistribution. particles particles Quotation withheld because this record is not cleared for redistribution.

The full text of this article is not redistributable, so it is not included here. The evidence sentences are withheld with it; the tag layer and its grounding status remain. The article itself is at https://doi.org/10.1371/journal.pone.0111913.