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Published byMartin Ramsey Modified over 8 years ago
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Human Population
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Humans Approx. 7 billion people on earth
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Biotic potential The maximum growth rate. Human biotic potential is about 6%. (our population would double every 12 years if we reached our biotic potential)
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History of the human population Hunter-gatherers – humans in early history nomadic, didn’t have much impact, small populations. Agrarian – about 10,000 years ago settled, planted/raised own food, more stable
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Demographic transition Stage 1 = pre-industrial (developing countries) birth rate & death rate are high slow population growth (if any) Stage 2 = industrial (early) improved technology/medical, birth rates high, death rates fall, increase in growth rate
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Stage 3 = post-industrial birth rates decline, growth rates decrease. (U.S. is in this stage!)
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Reasons for birth rate declines Working women Education Available birth control Postpone marriage/family Increase in costs for children (have fewer)
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Which areas are growing Developed countries are slowing or declining Undeveloped or developing countries are growing
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Problems with population growth 1.Shortage of fuel wood wood for cooking & heating malnutrition, famine, disease
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2. Shortage of clean (potable) water water borne illnesses (cholera, dysentery, typhoid) are typical in some countries/areas
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3. Increase in disease crowding, sanitation issues
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4. Increase in poverty fewer jobs, ¼ of the world’s population in cities will be homeless due to overcrowding
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5. Increase in conflicts fewer resources = increased competition civil wars are increasing due to lack of food, water & other resources
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6. Increase in refugees people leaving homes due to conflict, lack of resources etc. creates problems for areas they move to (lack of resources & infrastructure)
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Solving problems related to population growth Some countries are encouraging family planning available birth control, tax incentives, etc… Conserving resources/reducing consumption developed nation use the most resources, produce the most pollution (US consumes 10X the resources & goods of people in undeveloped countries)
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