The physical shapes that plastics can take in themselves pose a significant hazard that concrete does not have.
Nylon rope, plastic sheeting/straps, 6-pack loops, etc… all have the potential to trap animals with lethal consequences highly probable. As an example, here is a [Youtube](https://www.youtube.com/@OceanConservationNamibia/videos) channel dedicated to rescuing Seals from being caught up in all manner of things like straps, fishing line, netting, etc… 98% of which is plastic and the damage it visibly does (cuts through the skin and blubber all the way to the bone) is horrific.
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