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Understanding Populations

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Presentation on theme: "Understanding Populations"— Presentation transcript:


2 Understanding Populations
The Environment and Society

3 The Environment and Society
Objectives Describe “The Tragedy of the Commons” Explain the law of supply and demand List three differences between developed and developing countries Explain what sustainability is, and describe why it is a goal of environmental science

4 The Tragedy of the Commons
Garrett Hardin- Conflict between the short-term interests of the individual and the long-term welfare of the society Example: The Commons- the area that belonged to the whole village Can be applied to today’s problem with natural resources

5 The Tragedy of the Commons
Individuals put as many animals in the commons as possible Too many destroyed the grass Everyone suffered Replaced by closed fields owned by individuals Owners more careful Someone or group must take responsibility


7 Supply and Demand Law of economics that states as the demand for a good or service increases, the value also increases Example: world oil production



10 Costs and Benefits Cost-benefit analysis: Balance the cost of action against the benefits expected Environmental regulations paid for by taxpayer/consumer Risk Assessment Cost- Risk of undesirable outcome Create cost effective ways to protect environment

11 Developed and Developing Countries
Unequal distribution of wealth and resources around the world Developed countries: Higher incomes Slower population growth Diverse industry Strong social support Use 75% of world’s resources 20% of world population More waste and pollution per person

12 Developing Countries Severely overpopulated regions
Lower average incomes Simple agricultural-based communities Rapid population growth Using resources and polluting faster than can be replaced or cleaned up Severely overpopulated regions Forests stripped bare Topsoil exhausted Animals driven to extinction Malnutrition Starvation Disease


14 Ecological Footprints
Calculations that show the productive area of earth needed to support one person in a country Estimates land used for crops, grazing, forest products and housing Includes ocean area for seafood Includes forest area to absorb pollution


16 A Sustainable World Sustainability- The condition in which human needs are met which allows the human population to survive indefinitely Key goal of environmental science Current world not sustainable Developed countries using resources faster than can be replaced

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