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This might be true, but it seems commonly described as the major contributor because it's 40-70% of floating plastic and macroplastics. On the other hand, microplastics sink to the ocean bed. https://hillnotes.ca/2020/01/30/ghost-fishing-gear-a-major-s... I'm not sure which has more environmental impact.

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Plastics that do actually sink to the ocean bed are actually carbon sinks, a good thing as long as they don’t do so much damage to the ecology on the way down.

The two major carbon sinks which really matter are building up global living biomass (i.e. replanting forests) and getting carbon locked in sediment on the ocean floor (by building up living ocean biomass that rains down on seafloor areas which are actively building up sediment.

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