I have discussed this some time back, but the topic is important enough to revise: the decline in the quality of sperm throughout the developed world:
http://www.shtfplan.com/headline-news/the-human-race-could-be-infertile-in-50-years-a-push-for-depopulation-will-be-global-crisis_01302018
“Last summer, scientists at the Hebrew University of Jerusalem found that male sperm counts had fallen by almost 60 per cent in 40 years. In what was the largest study of its kind, they analysed data from 43,000 men from North America, Europe, Australia and New Zealand, taking in 185 studies from 1973 to 2011. Its lead author, Dr Hagai Levine, decreed the result an ‘urgent wake-up call’.”
http://www.telegraph.co.uk/health-fitness/body/spermageddon-human-race-could-infertile-50-years/
https://www.npr.org/2017/07/31/539517210/sperm-counts-plummet-in-western-men-study-finds
The human race, according to this could be infertile in 50 years, maybe less. There is much speculation about the causes of this, but one line of thought has it that hormone disrupting chemicals, upon which the modern throwaway society floats could be taking their toll. Maybe this is the best reason to downscale and adopt a more healthy natural lifestyle, for the sake of one’s sperm!