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Overpopulation_pop+control_part+1_students

Overpopulation_pop+control_part+1_students - Overpopulation...

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1 Overpopulation and Population Control – Part I Cunningham and Cunningham (2009): Chapter 4 Miller (2003): Chapter 11 Population Reference Bureau (PRB) (2009): www.prb.org
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2 Lecture Outline z Population Density and Effective Population Density z Overpopulation z Ecological Footprint and Biocapacity z Environmental Impacts of Population
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3 Overpopulation
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4 Sustainability Sustain = Maintain Sustainability: A central theme of environmental science and of human development and resource use z We should use resources (e.g. energy, water, land, wildlife, natural environment) in ways that do not reduce them Æ Use resources in sustainable ways z Resources should be preserved so that future generations can have lifestyles at least as healthy and happy as ours – or perhaps better
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5 Can We Live Sustainably? Carrying capacity = Maximum number of individuals of a species that can be supported by a particular ecosystem over a certain period of time Technological , social and cultural changes Æ Have increased the earth’s carrying capacity for the human species z Increased food production z Uninhabitable areas become habitable (extensive use of energy and other resources) How long can we keep doing this?
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6 Population Density Very often, overpopulation Crowding z Too many people in a given area z Population density too high Africa: 55 people per sq mile (1 mile = 1.6km) Europe (excluding the USSR): 261 Japan: 857
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7 Effective Population Density The habitable part of Africa (excluding desert or impenetrable forest) = Just over ½ of Africa’s total area Æ Effective density = 117 people per sq mile ( 1/5 of effective density in UK!) z Even by 2020 z Africa’s effective density France’s effective density (266 people per sq mile)
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8 Overpopulation Occurs When… Overpopulation occurs when z Long-term carrying capacity of an area is being degraded by its current human occupants
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