Is there any large scale proof of this testosterone crisis? When I looked into it I found a lot of theories and assumptions but no real evidence for it.
I wouldn't be surprised if testosterone production was lower due to various changes in environment and society, but assuming it's true I don't understand what would make it a crisis.
Maybe because ultimately that means the extinction of the human race ? Dude, not all humans hate themselves to the point of wanting to disappear.
Because testosterone affects fertility, which is very important.
Are people who want to have children having significantly more trouble producing them?
If you're fishing out of a lake and you notice you're catching the fish faster than they are being replaced you may want to note this and keep an eye on what's going on. Especially when fish are your only food source.
Yes.
search for
> site:news.ycombinator.com testosterone
no shortage of discussions here, both recent and old