Children in the future will have to be born in test tubes. I listened to a pod cast about this and the science basically says we are fucked, and nobody knows why.
It's not just sperm either. Miscarriages are going up sharply as well.
To add to this, I have apparently been shooting blanks my entire life. Part of 1% of men on the planet that are sterile. Found out a year ago...
My guess is that a decent portion of men will be unaffected or only mildly by the changes and still be able to reproduce naturally. Maybe it'll just be the top 20% healthiest. Might end up being that being born a fertile man is like winning the lottery some day.
We are living pretty unnatural lives. Lots more office jobs, lots more unhealthy food. I think modern life is uniquely stressful when compared to living in earlier time periods. I know I know, everyone wants to be like "Hey, there is no tiger going to eat you now," or some such "back in my day."
You are exposed to an incredible amount of information these days, including in modern advertising. You just didn't get this kind of stimulation in the past. Also, I know everyone has a different experience with the job market but I think that a lot of jobs that currently exist are particularly stressful. Lots of competition for work, always someone willing to take your place. I've heard of people barely doing a thing and making 100k, maybe this is just people bragging, but that's not been the experience of mine or anyone I know. Anyone I know who is even making 40k is working very hard, at jobs that are stressful, and where their supervisors almost go out of their way not to give any feedback so even if you've been somewhere for more than a year you really have no clue if you are going to be given the boot.
I spent many years after college doing temp work in my field before I got what I consider to be a decent job. So imagine you turn 18, you go to college while working at Starbucks or Wal Mart and living with your parents, and then you do temp work that only pays slightly better than those jobs for three or four years before you have enough experience to actually have a chance at a job that pays a living wage. If you knew exactly what you wanted to do and went to college, and chose a viable field when you are 18, it's going to be about 25-26 before you are actually making a living. How many people make bad decisions at 18 because they didn't have good information? Or couldn't figure out what they wanted to study till they were 22-23?
I don't think people were meant to live like this. In order to have a good life you have to make a lot of good decisions, and from a fairly early age or you are going to be way behind and not get your stuff together till your early or mid 30's. With some exceptions depending on your career field, you basically aren't an adult until your 30. Have the effects of that been studied? I personally wouldn't be surprised if changes in the social environment accounted for part of the problem. I bet living with your parents until you are 30 and the mental effects of feeling powerless because of their inability to immediately earn a living is actually quite devastating mentally to many.