[ninkendo]

To be fair, “the last 80 years” coincides with a lot of stuff. The world has changed a lot since the 1940s. Isolating plastics as a cause and accounting for all other variables is next to impossible.

[ethanbond]

We have really great studies showing plastics disrupting fertility systems in other mammals though.

This hypothesis is not formed merely from “sperm quality has declined since 1940” and “plastic use has gone up since 1940.”