He started by talking about global fertility rates. He then mentions lower sperm counts but it's not a given that one is solely or mostly because of the other. Fertility rates are expressed in children per woman, not sperm count.
A large drop in global fertility rates is attributable to lower infant mortality, better access to healthcare, contraception, and education about using it. Also, as levels of education in general rise, people tend to have fewer children.
A large drop in global fertility rates is attributable to lower infant mortality, better access to healthcare, contraception, and education about using it. Also, as levels of education in general rise, people tend to have fewer children.