Why has Male fertility decreased majorly in the last 100 years?

Anonymous
I’d try to give my own theory but I don’t have one. Maybe it has something to do with the industrial revolution and all the smog? I don’t know. What do you think?

I hope my question is correct because I remember seeing this statement in a few news articles in the past.
Why has Male fertility decreased majorly in the last 100 years?
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