20% is a big share.. so they can pay 20% of the costs, i am sure it's not that difficult to identify the companies/industries that dumped the rest of this stuff into water.
Or we can just do nothing, and wait for this to take over the entire ocean.

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Человек, который почувствовал ветер перемен, должен построить не щит от ветра, а ветряную мельницу