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They estimate that a 1000 rivers contribute 80% of the _riverine_ plastic pollution.

But how much of the total in the oceans is riverine versus 'oceanic'? What is the total contribution of maritime activity (freight, fishing, cruises, recreational, military) to a non-riverine/oceanic plastic?

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From what I've seen, the only oceanic activities that add much is fishing, which seems to be currently estimated to produce around 20% of global oceanic plastic waste. I believe the link may have mentioned this. If not, some of the references at the bottom will.

I looked through the interactive data and the paper this references as a source, it always refers to contributions as a percentage of total 'riverine' plastic. But never quantifies how much it is in relation to the remaining non-riverine contributions?

IF you want the raw numbers, check out the references at the bottom, particularly the "top" reference, published in 2021, which is where the raw data is.

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