Human Population Example of Exponential Growth Phase JShaped

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 resources Increase 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 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

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