Concrete has problems, but the simple reason is that ultimately it is an aggregate of natural materials whereas plastic is synthetic.
Something that is persistent, synthetic and interacts with the biosphere is problematic because animals aren’t designed to deal with plastics in their body. Whether that’s endocrine system problems screwing up hormones or simply choking and clogging on plastic debris outright.
TLDR – animals know how to deal with rocks. They don’t know how to deal with entanglement in nylon rope or swallowing bottlecaps.
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