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There are sea snails living near volcanic vents that metabolize the extra iron into shells and plating. I expect we’ll see a similar adaptation at some point. Simple organisms issuing plastic in some sort of process that toughens their shells. If left unchecked we may see an evolutionary leap as more things adapt, and a die off as plastic becomes a finite resource. Future generations may argue the merits of artificially supporting the microplastic ecosystem in the same vein that we argue about reducing it.
I agree with everything you said here except you’re read on that question. There’s a huge area between expecting your partner to take your personal safety seriously, and expecting your partner to kill for you. One of those is a reasonable ask, the other is a reasonable excuse to leave.