Chapter 17: Population, Urbanization, and the Environment

Demography is the scientific study of human populations, examining the determinants and consequences of population change, size, growth, and structure.
Demographic Balancing Equation: $\text{Population} = \text{Births} - \text{Deaths} + (\text{Immigration} - \text{Emigration})$ .
Population changes act as primary forces behind social and technological shifts, influencing global labor markets and regional conflicts.
Regional instability is often aggravated by youth bulges, particularly in the Middle East and South Asia.

This theory suggests that economic and social development leads to a decline in mortality followed by a decline in fertility.
It is derived from modernization theory and based on the historical experiences of developed nations.
Critiques highlight its ethnocentric perspective and the assumption that modernization is a natural, inevitable process.

Fertility Transition: The shift from high fertility and "family building by fate" to low fertility and "family building by design" under woman's control.
Health and Mortality Transition: The transition from high death rates among the young due to infectious diseases to deaths at older ages from degenerative diseases.
Urban Transition: The reorganization of society from rural and agricultural life to predominantly urban and nonagricultural structures.
Age Transition: The move from young populations to older population structures.
Family and Household Transition: Increasing diversity in living arrangements driven by higher life expectancy, divorce, and delayed marriage.

The sex ratio ( $\frac{\text{male}}{\text{female}}$ ) typically ranges from $104$ to $110$ .
Feminization of Old Age: Due to higher male mortality rates, women comprise $\frac{2}{3}$ of the population aged $75$ and older in the United States.
Early marriage serves as a significant barrier to gender equality, linking high fertility with lower social status for women.

Ecological Footprint: A measure of human resource demand relative to the planet's capacity to regenerate.
Declining mortality increases food consumption, while declining fertility contributes to social and economic empowerment for women.
Shifting age structures can create high dependency levels, straining an economy's ability to generate savings and investment for new jobs.