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ES 9_23_09 Human Pop

ES 9_23_09 Human Pop - Human Population How many people are...

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9/24/09 1 Human Population How many people are on the planet? How fast is the human population growing?
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9/24/09 2 How many humans can Earth sustain? Does Earth have a carrying capacity for humans? – Have we reached it? – Have we exceeded it? – Are we at that inflection point where density dependent factors start to limit our population? – Is the logistic curve necessarily a correct model of human population? Weighing in Malthus (1798) – An Essay on the Principle of Population Paul Ehrlich (1968) – The Population Bomb Garrett Hardin (1968) – Tragedy of the Commons
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9/24/09 3 Although predicting how many people Earth can sustain seems impossible, we still need to consider the data… • Demography: – size, composition, and distribution of populations – how their patterns of change over time through births, deaths, and migration – the determinants and consequences of such changes World Population Data: Exponential Growth Curve - Most of human existence (0.002 % per year) - Late 1700’s - 1950
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