babies -> needed for civilization to continue weed -> possibly negative effect on civilization ( https://pmc.ncbi.nlm.nih.gov/articles/PMC2424288/ https://pmc.

babies -> needed for civilization to continue weed -> possibly negative effect on civilization ( https://pmc.ncbi.nlm.nih.gov/articles/PMC2424288/ https://pmc.ncbi.nlm.nih.gov/articles/PMC2424288/) , certainly not a requirement.