so are fruit trees grown on plastic-grass gardens and crops watered with plastic hoses (all of them, I guess) damaging our health?
Imagine an ignorant otherworldly being observing earth from a very macro timescale, and trying to understand what series of chemical reactions caused the production of so much plastic so suddenly. It would be like the KT boundary.
"Conceivably a geological process, but very finely tuned in so many ways..."