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Understanding Human Populations: History, Growth, and the Future of Sustainability

Explore the evolution of human populations from early hunter-gatherers to modern societies. This lesson delves into Canada’s population dynamics, global population trends, and the impact of population density on urban living. Discover the journey of our ancestors, the advent of agriculture and domestication, and how these developments led to increased population density and societal advancements. Understand the role of diseases, the impact of the Industrial Revolution, and the future population scenarios, including sustainability challenges and potential growth trends.

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Understanding Human Populations: History, Growth, and the Future of Sustainability

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Presentation Transcript

  1. Lesson 1_01Human Populations Or “Making Babies”

  2. The Present Situation • Canada’s Population • World Population • Population Density • Clumped dispersion in cities • Countries with extreme populations and population densities

  3. Our Story – Early Humans • The first humans were hunter-gatherers (100 000 years ago) • Ability to learn and communicate verbally • The only animals to be skilled in using tools and fire • This affected their diet: plants  animals • Inhabited most of Earth by ~12 000 y.a.

  4. Our Story - Civilization • Domestication (~10 000 y.a.) • Plants: wheat, oats, rice, corn • Animals: sheep, goat, cow, horse, pig • Areas that were able to domesticate more species developed further • especially grains and animals for food & work • Led to more food  higher population density, birth rates (natality) • Led to more free time  stationary living, writing, technology, politics

  5. Our Story - Disease • Disease • Epidemics break out in large, stationary populations (this still happens in Asia – think Avian Bird Flu) • Spread from animal hosts to humans • E.g. influenza, malaria, TB, measles, smallpox • The Black Death (Bubonic Plague) Yersinia pestis bacterium

  6. Our Story – Modern Humans • Science and Medicine • Understanding of and interaction with the natural world improved (physics, chemistry, biology) • E.g. Conversion of energy forms, germ and cell theory • The Industrial Revolution • Medicine, sanitation, materials and structures, printing, manufacturing, technology • Led to even more free time, increase in natality, drop in mortality, increase to immigration and emigration

  7. Who is “Industrialized”? • Demographic Transition Model (4 stages) • Preindustrial • low growth rate • Transitional • Death rate decreases, growth rate peaks • Industrial • Birth rate decreases, growth is low • Postindustrial • growth is zero or negative

  8. Our Story – The Future • The future (3 options) • Growth continues • Growth stabilizes • Population crashes • What is a sustainable human population? • David suzuki on exponential growth

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