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Human Population
Example of Exponential Growth Phase (J-Shaped Curve)
• Eg. Human Population– Human population increased
relatively slowly until about 1650.– It then doubled in the next two
centuries.– It doubled again in the next 80
years.
– Our population is now over 7 billion.• This increases by 80 million/year• This in an increase of 214,000/day.• It takes 3 years for the world population to add the population
equivalent of another U.S. (which is around 300 million).
Example of Exponential Growth Phase (J-Shaped Curve)
Human Carrying Capacity
• How long will it be until we reach our carrying capacity? What will happen then?
• What factors increase our carrying capacity?– Farming– Medicines– Better sanitation– Resource choice
Resource Choice
• What is the roll of resource choice on human carrying capacity?
• It depends on 3 types of choices:
• 1. renewable resources• 2. Non renewable
resources• 3. Rate of
consumption
Human Carrying Capacity—Resource Choice
Renewable resourcesIncrease carrying capacity
– resources that come from things that can regenerate
eg. Fish, timber, wind
Human Carrying Capacity-Resource Choice
• What factors decrease our carrying capacity?
• Nonrenewable Resources– Resources that are finite
• Eg. Oil, Natural Gas, Coal
• AND….
Human Carrying Capacity-Resource Choice• Rate of Consumption– Over consumption leads to a
decrease in carrying capacity.
Human Carrying Capacity
• What impact does this stretching our carrying capacity have on other species.– Endangers them or
completely wipes them out.
Human Carrying Capacity-Resource Choice• Using the graph explain why exceeding the
global biocapacity per person negatively impacts other species.
Human Carrying Capacity
• What are some consequences of human population growth?– Global Warming • Caused by the
increasing burning of fossil fuels which lead to enhanced greenhouse effect.
– Pollution– Acid Rain– Pile up of Waste
– Ozone Depletion
The End!!