Lesson 5.4 - Human Population Dynamics

Lesson Overview

  • Lesson 5.4: Human Population Dynamics

Learning Goals

  1. Understand factors affecting human population growth rates.

  2. Explain the connection between population density, ecological footprint, and biocapacity.

  3. Analyze population pyramids to deduce implications for population growth states.

Launch Activity (pg. 549)

  • Questions:

    1. Identify factors affecting human population growth as shown in the graph for age groups below 16.

    2. Predict the impact of age 65+ demographics on future populations by 2050.

    3. Discuss changes in lifespan and family size in Ontario from 1867 to present.

Current Human Population Statistics (pg. 5)

  • Global Population:

    • 2022: Reached 8 billion

    • Projected: 9.5 - 12 billion by 2050

    • Historical milestones:

      • 1800: 1 billion

      • 1927: 2 billion

      • 1960: 3 billion

      • 1974: 4 billion

      • 1987: 5 billion

      • 1999: 6 billion

      • 2011: 7 billion

World Population Growth Trends (pg. 7)

  • Current phase: Rapid population growth but decreasing growth rate.

  • Per capita growth rate: 1.1.

  • Decreasing doubling time for populations.

  • Projections on Earth's carrying capacity vary.

Factors Influencing Human Population Growth (pg. 8)

  • Contributions:

    • Technological advancements

    • Agricultural improvements

    • Animal domestication

    • Enhanced healthcare

    • Engineering developments

    • Better food storage and transport

Population Growth Rate Distribution (pg. 9)

  • Growth primarily in developing countries.

  • Declining populations in developed countries.

Global Population Density Map (pg. 10)

  • Population density varies (people/km²) across regions.

Carrying Capacity Considerations (pg. 11)

  • Some regions have higher population densities, potentially reaching local carrying capacities first.

  • Wealth disparity: Wealthiest 20% produce 53% of carbon emissions, unlikely to reach capacity soon.

Ecological Footprint (pg. 13)

  • Definition: Land needed to meet 1 person's needs, including food, energy, and resources.

  • Developed countries typically have larger ecological footprints.

Biocapacity (pg. 14)

  • Measures how many resources are available in a region.

  • Carrying capacity: Generally exceeded since the 1980s.

Understanding Population Pyramids (pg. 16)

  • Visual representation of a population by age and sex.

  • Shapes indicate growth state:

    • Kenya: Triangle shape = rapid growth.

    • Sweden: Rectangle shape = stable population.

Homework Assignments (pg. 18)

  • Reading: Textbook p. 550-555.

  • Questions: Textbook p. 556 #1-2,4-7,10-11,13-15.