As I understand it, most of the crap that’s waste from the ocean is polyethylene and polypropylene that have been heavily degraded by UV and have a lot of accretions from their time in the ocean. They’re not recyclable as plastic (even if they were really clean, it’s not economically feasible), though you could burn them with a lot of air pollution, or use industrial processes to pull the hydrocarbons out to repurpose, though the polluted plastic you’re putting in is more expensive to process.
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