It is not only human sperm that is in a critical state. Most people involved with livestock breeding from cattle to sheep to goats to dogs will talk about their prize stud bulls etc lately shooting blanks.
Phytoestrogens and xenoestrogens are emmasculating our men, and it is intentional. No society can have this much toxic stuff in our environment unless it is on purpose.
I suspect it is the same with Japan, Singapore and other developed asian countries. I don't think it is necessarily a wests problem, I think it's a developed civilization problem.
Nonstick pans
Food in contact with plastic
Synthetic-fiber clothing
Pharmaceuticals
Processed food
Our very survival is at stake.
I think micro plastic is the reason for the falling sperm count.