The most common plastics have been in wide use for nearly a century. It's not "unexplained"; the fetility decline is a product of many variables that include diet and lifestyle changes, and especially as it correlates with population growth, this could be another feedback loop. Pointing to one of the most widespread materials which have been in use for much longer is nothing but fearmongering.

Might as well ascribe the "unexplained life expectancy increase" to plastics too. /s

and that pet-dogs have a dose-dependent reduction in viable sperm count inversely correlated with the plastic concentration

Correlation or causation? Or just a variant of the old "IN MICE!"?

Add that to the widespread phenomenon of p-hacking and a lot of this "research" is just politicised junk optimised for engagement rather than truth.