8 what were some of the demographic reasons

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Unformatted text preview: owth in the size of the global population? 1. New sanitation practices 2. Improvements in medical science and practice 3. Economic growth, industrialization, and urbanization Global Population Change Global Population in Billions Most recent estimates predict a significant drop in the rate of population growth Global population growth is primarily driven by population growth in developing countries Fertility rate: average number of children born to each woman Demographic Transition: Country moves from high birth and death rates to low birth and death rates Population is stabilizing in some countries Age Structure: Number and proportion of people in each age group in a population Shape is important: Pyramid = fast growth; and Tapered bases = slow or negative growth Future population growth is determined by prereproductive individuals Carrying capacity: largest population that can be sustained indefinitely Changes in response to environment J-shaped curve S-shaped curve Populations are always changing and are slightly above or below carrying capacity Too high crash Earth’s Carrying Capacity 4 billion – 16 billion people Why such a large range? What could happen to the environment? Have we already exceeded our carrying capacity? Population and Water Access in Bangladesh • Bangladesh’s Population and Water Acces...
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This document was uploaded on 03/01/2014.

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