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Human Population

Explore the history of human evolution, from Homo habilis to Homo sapiens, and key events like the Agricultural and Industrial Revolutions. Discover the impact of population growth on society, environment, and resource competition.

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Human Population

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  1. Human Population BIO 103 Human Ecology Dr. Phoebe Smith

  2. History of human evolution • Homo habilis • ~3 mya in Africa • Use of simple, stone tools • Homo erectus • ~1 mya in Europe & Asia • Homo sapiens • ~1.3 mya in Africa • ‘Out of Africa’ theory

  3. Hunter-Gatherers • Consumed about 0.1% of biological production in the ecosystem

  4. Agricultural Revolution • Ocurred ~12,000 years ago in Middle East • Led to domestication of plants (crops) and animals • Increased percentage of biological production consumed • Increased carrying capacity

  5. Largest populations in river valleys of India and China • 14th c.--plague reduces world population by 25% • 16th c.--European colonialism and trade

  6. Industrial Revolution • 18th c. • Agriculture: wheat, corn, potatoes, sweet potatoes and rice • Technology increased production and carrying capacity • By the 19th c., large families (for labor) were no longer necessary

  7. Green Revolution • ~40 years ago • High-yield crop varieties (rice, wheat and corn) • What are the environmental effects of fertilizers, pesticides, etc.?

  8. Current population growth rates

  9. Population regulation • Are there cultural practices that limit population increase? • Territoriality • Polygamy • Infanticide • Breast-feeding

  10. Consequences of population explosion • Quality of life • Lack of food • Environmental refugees migrate to cities from rural areas • Competition for resources • War in Iraq • May be controlled • Birth control • Education

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