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08_28_BigThree

08_28_BigThree - The Big Three Energy Water and Food Energy...

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The Big Three: Energy, Water, and Food
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Energy, water, food in the context of population growth
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Billions 0 1 2 3 4 5 6 7 8 9 10 1950 1970 1990 2010 2030 2050 Less Developed Regions More Developed Regions Source: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005. Growth in More, Less Developed Countries
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The city of Cairo: close to 20 million, growing about 1 million/year Due both to births and to immigration from rural areas Population Some key concepts Environmental impacts of humans related to population and rate of resource consumption/pollution Population growth rates Age structure & the demographic transition
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The prophecy of Thomas Malthus (19thC) - Humans need food - “Passion between the sexes” will remain strong, thus continued high birth rates - Capacity of earth to produce food is limited - Result: more people than food to support them “Gigantic famine stalks in the rear, and with one mighty blow, levels the population with the food of the world.” Was he right or wrong?
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Equation for population change P2 = P1 + (B-D) + (I – E) P1 and P2 are populations at time 1, 2 B = births D = deaths I = immigration E = emigration
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Income per individual (USD) Total Fertility rate
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Characteristic age structures of developing countries and developed countries.
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The bulge in US population from the ‘baby boom’ after WW2
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While there are reasons that governments would like to limit population growth, it is difficult to do in practice. Only China, with its strong central government and enormous existing population (1.3 b) has imposed limits on families.
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Poster in Chungching, China extolling the virtues of the one-child family.
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In Chinese cities, population is densely concentrated, and most people get around on foot, bicycle, or public transit.
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