Population and Migration Notes

  • UNIT 2 - PART IB: POPULATION

  • Focus on population dynamics and migration

  • Enduring Understanding (2.B)

  • Populations grow and decline over time and space

  • Key questions include: Where are populations distributed? What causes growth? What health challenges do populations face? What could lead to future increases?

  • **Essential Question

  • Discuss in groups:**

  • Political, social, and economic consequences of rapid population growth over the last 200 years?

  • Population Growth and Decline

  • Quote by Garrett Hardin: "A finite world can support only a finite population…" – highlights the limits of resources

  • Pre-19th century: slow population growth due to limited agricultural techniques

  • 1800: Population reached 1 billion; today approximately 7.4 billion, predicted to reach almost 11 billion by 2100

  • Measuring Number of Births

  • Crude Birth Rate (CBR): live births per 1,000 people per year

  • Total Fertility Rate (TFR): average number of children born to a woman in her lifetime

  • TFR reflects cultural norms better than CBR

  • Historical TFRs were higher; increased infant mortality led to larger families but slower population growth

  • Changes in Fertility

  • By the 1800s in Europe, TFR began to decline, influenced by various factors:

  • Unintentional: Longer military service kept men away, reducing births

  • Intentional: Industrial Revolution reduced the need for child labor, improving longevity

  • Role of Women

  • Industrialization led women to work outside the home; smaller living conditions encouraged smaller families

  • Education and work opportunities reduced TFR

  • Significant decline in TFR between 1990 and 2007 as young women gained education

  • Family Planning

  • 20th-century improvements in family planning led to fewer unintended pregnancies and larger intervals between children

  • Religious beliefs can impact fertility rates; higher rates in traditional contexts due to lower birth control usage

  • Life Expectancy

  • The increase in life expectancy is a primary factor for population growth

  • Decline in infant mortality rate is crucial; example: Massachusetts IMR dropped from 130 to 4 per 1,000 from the 1850s to today

  • Contributing Factors to Higher Life Expectancy

  • Food Production: Mechanization and agricultural advances boost food security and enable urban migration

  • Public Sanitation: Development of sewer systems and sanitation reduce diseases significantly

  • Healthcare Improvements: Vaccines and antibiotics have drastically reduced mortality from infectious diseases

  • Demographic Transition Model (DTM)

  • DTM illustrates population changes from agricultural to industrial societies across five stages

  • Stages of DTM:

    • Stage 1: High birth and death rates (little growth); examples are isolated groups

    • Stage 2: High birth, declining death rates (rapid growth); example: Mali

    • Stage 3: Declining birth and death rates (slowing growth); example: Mexico

    • Stage 4: Low birth and death rates (stable); example: United States

    • Stage 5: Very low birth rates falling below death rates (declining); example: Japan

  • Population Pyramids

  • Each stage of the DTM produces distinct pyramid shapes reflecting population structure and growth rates

  • Malthusian Theory

  • Thomas Malthus argued population growth outpaces food production, predicting societal famine; food grows arithmetically while population grows exponentially

  • Critiques note that technological advancements allow for greater food production than Malthus foresaw

  • Neo-Malthusians: adapt Malthus's ideas to modern concerns about resource depletion

  • Ester Boserup: opposed Malthus, arguing technology results in agricultural advancements that meet population demands

  • Epidemiological Transition Model (ETM)

  • Stages linked to DTM and describe shifts in prevalent diseases as societies modernize

  • Stage 1: Pestilence and famine; high mortality rates

  • Stage 2: Receding pandemics; improved sanitation and medicine

  • Stage 3: Human-created diseases; aging populations lead to chronic diseases

  • Stage 4: Delayed degenerative diseases; medical advances postpone onset of diseases

  • Stage 5: Reemerging infectious diseases due to antibiotic resistance

  • Population Policies

  • Policies can be Pro-natalist (encouraging births) or Anti-natalist (restricting births)

  • Example Anti-natalist policy: China's One Child Policy (1979), with effects on workforce and gender ratio

  • Pro-natalist policies implemented in countries like Sweden and Japan encourage larger families through financial incentives and support systems

  • Changing Fertility Rates

  • Changes often driven by education, employment access, healthcare, and societal shifts regarding women's roles

  • Aging Population Implications

  • Influences on retirement, dependency ratios, and political dynamics as demographic composition shifts toward older populations.

  • Environmental Determinism

  • The theory that the physical environment, particularly the climate and geography, shapes human societies and cultures.

  • Suggests that human behavior and societal development are determined by environmental conditions, leading to limitations on cultural and technological advancements.

  • Influential in early geographic thought, but criticized for oversimplifying the relationship between environment and human agency.

  • Proponents argue that regions with harsher climates tend to have less economic and cultural development, while those with more hospitable climates flourish.