3-15 - 1. Why did Malthus predictions not materialize?...

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1. Why did Malthus’ predictions not materialize? Green Revolution o Synthetic fertilizers Use to depend on Nitrogen fixing bacteria Pollution of ground water waterways ocean Nitrogen & Phosphorous o High-yielding seeds o Irrigation Cheap Energy (Coal) 2. Why did Paul Ehrlich’s predictions not come true? GMO’s (Genetically Modified Organisms) 3. Demographic Transition Model Phase 1 – Pre-industrial; Hunter – Gatherer society Phase 2 – Became agriculturalists, domesticating plants and animals; Periphery High BR & Declining DR; exponential growth rate Phase 3 – Declining BR, Low DR Education, family planning, women working can’t have larger families Phase 4 – ZPG (Zero Population growth) leveled off THREE DIMENSIONS OF POPULATION EXPLOSION 1. Unmet demand for family planning a. Services are unavailable or too far for women to travel 2. Desire for large families a. High mortality rates mean you need to have more children for them to
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3-15 - 1. Why did Malthus predictions not materialize?...

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