01:59
The Delicate Balance, Part 1: Demography of Population Growth
Projecting population growth begins with three basic assumptions: everyone is born at age zero, everyone dies, and the earth is a closed system. Based on current fertility patterns, the world population will reach 296 billion people by 2150, compare...
06:39
To Parent or Not to Parent: Why Couples Are Having Fewer Children
Families in the late 19th century had, on average, about six children, while the number of children per family today has dropped to only about 1.8. Some experts believe this de-coupling of marriage and childbearing has come about because children ...