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Lesson 1_01 Human Populations

Lesson 1_01 Human Populations. Or “Making Babies”. The Present Situation. Canada’s Population World Population Population Density Clumped dispersion in cities Countries with extreme populations and population densities. Our Story – Early Humans.

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Lesson 1_01 Human Populations

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  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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