And maybe microplastics have the opposite effect. But this is just speculation, and afaik no sources support this.
Edit: I dunno why I got downvoted. Maybe I should be more specific that my claim, “maybe microplastics have the opposite effect”, has no support. I didn’t mean OP’s claim was unsupported.
Probably due to the absence of lead that the previous generation got due to leaded gas emissions.
And maybe microplastics have the opposite effect. But this is just speculation, and afaik no sources support this.
Edit: I dunno why I got downvoted. Maybe I should be more specific that my claim, “maybe microplastics have the opposite effect”, has no support. I didn’t mean OP’s claim was unsupported.