This question is difficult to answer. Estimates are usually based on food, but human agriculture limits assumptions on available amounts. Human population.

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Presentation transcript:

This question is difficult to answer. Estimates are usually based on food, but human agriculture limits assumptions on available amounts. Human population growth rate has been growing more than exponentially. What is the carrying capacity of Earth for humans?

HUMAN POPULATION GROWTH domestication of plants, animals 9000 B.C. (about 11,000 years ago) agriculturally based urban societies beginning of industrial, scientific revolutions

Expansion of habitat Increased capacity in existing habitats Substituting and importing resources Population has sidestepped limiting factors:  Technology (agriculture)  Medicine

 The availability of food and water  Invasion of parasites, pathogens, or disease  Over-crowding  Severe or sudden climatic changes  Pollution of air, soil and water

If we do not take steps to control human population growth, it is likely that one or more of these growth- limiting factors will eventually kick in to forcibly reduce our numbers.

 Crude birth rate = the number of births per thousand individuals in a population per year.  Crude death rate = the number of deaths per thousand individuals in a population per year.  Fertility = the potential of reproduction exhibited in a population.

Developed Nations Developing Nations

Natural increase rate = the form in which human population growth rates are usually expressed Crude birth rate – crude death rate 10

Human Population growth = 1.4% per year Developing nations = 1.7% Developed nations = 1.0% Year Population (billions) Developing Countries Developed Countries Projections

Doubling time (T) = 70. annual percentage rate (g) Doubling time (T) = 70. = 50 years 1.4 Doubling time = the number of years it would take a population to double its size at its current growth rate.