11/4/2022 0 Comments Unreal world cultures 3.4![]() ![]() ![]() One hundred years later, there were roughly six billion people in the world, and as of 2011, the number was approaching seven billion. The process just described is called the demographic transition.Īt the beginning of the twentieth century, the world’s population was about 1.6 billion. In some countries (e.g., Russia and Japan), population is actually in decline, and the average age in developed countries has been rising for decades. Fewer families worked in agriculture, more families lived in urban areas, and women delayed the age of marriage to pursue education, resulting in a decline in family size and a slowing of population growth. ![]() However, by the middle of the twentieth century, birth rates in developed countries declined, as children had become an economic liability rather than an economic asset to families. Things changed dramatically during Europe’s Industrial Revolution in the late 1700s and into the 1800s, when declining death rates due to improved nutrition and sanitation allowed more people to survive to adulthood and reproduce. Only about five hundred million people lived on the entire planet in 1650 (that’s less than half India’s population in 2000). Geographers study how populations grow and migrate, how people are distributed around the world, and how these distributions change over time.įor most of human history, relatively few people lived on Earth, and world population grew slowly. It is a branch of human geography related to population geography, which is the examination of the spatial distribution of human populations. Demography is the study of how human populations change over time and space. ![]()
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