WK6_Population

WK6_Population - Society Technology and Environment...

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Population and Environment Society, Technology and Environment
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What is the size of the global population? Is it under 6 billion? Is it between 6 and 8 billion? Is it between 8 and 30 billion? Is it over 30 billion? Don’t know.
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Here We Are: by October 31, 2011
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So What?
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Derives from the work of Thomas Malthus (1766-1834) Malthusian Perspective
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Malthus and the Environment Tons of Food Millions of People Time People Food
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Is exponential growth of the human population likely to outstrip the global supply of food? Was Malthus correct?
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Global Population Growth Since 1AD
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Year Population 1400 350 million 1700 680 million 1800 900 million 1900 1.65 billion 1986 5 billion 1999 6 billion 2008 6.7 billion 2011 7 billion Growth of Global Population In the past 100 years, the global population has grown from almost 1.65 billion to 7 billion people, with almost 80% of that increase occurring after 1950.
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Rank Country Population Percent of World 1 China 1.3 billion 18.6 2 India 1.2 billion 17.1 3 United States 310 million 4.4 4 Indonesia 240 million 3.4 5 Brazil 195 million 2.8 6 Pakistan 174 million 2.5 7 Nigeria 158 million 2.3 8 Bangladesh 149 million 2.1 9 Russia 143million 2.0 10 Japan 127 million 1.8 10 Most Populated Countries in 2011
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What were some of the demographic reasons responsible for this dramatic growth in the size of the global population? 1. New sanitation practices
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2. Improvements in medical science and practice
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3. Economic growth, industrialization, and urbanization
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Global Population in Billions Global Population Change
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Most recent estimates predict a significant drop in the rate of population growth
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Global population growth is primarily driven by population growth in developing countries
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Fertility rate: average number of children born to each woman
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Demographic Transition: Country moves from high birth and death rates to low birth and death rates
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Population is stabilizing in some countries
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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
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Future population growth is determined by prereproductive individuals
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Carrying capacity: largest population that can be sustained indefinitely Changes in response to environment J-shaped curve  S-shaped curve
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Populations are always changing and are slightly above or below carrying capacity Too high  crash
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WK6_Population - Society Technology and Environment...

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