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Understanding Population Growth and its Impact on Earth's Resources

Explore how the human population growth impacts Earth's resources and the concept of carrying capacity. Learn about limiting factors, overpopulation issues, and ways to promote sustainable resource management. Discover how technology and responsible resource use can shape the future.

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Understanding Population Growth and its Impact on Earth's Resources

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  1. DNA:2. Explain what is going on in the cartoon below:

  2. KEY CONCEPT As the human population grows, the demand for Earth’s resources increases.

  3. Limiting Factors • Birth & death rates eventually balance • Factors: Disease, food, predators, climate, space, mates • Populations become stable • Carrying Capacity: greatest number of individuals that a population can sustain • What stage is the human population in?

  4. Earth’s human population continues to grow. • Earth’s human carrying capacity is unknown.

  5. Technology has helped to increase Earth’s carrying capacity. • gas-powered farm equipment • medical advancements • clean water • public assistance

  6. The Big Problem: Overpopulation • Over 6.6 billion people • Many natural resources are nonrenewable • Fossil fuels take millions of years to form • More people means: • 1) More forests removed • 2) More resources consumed • 3) More CO2 released

  7. The growing human population exerts pressure on Earth’s natural resources. • Nonrenewable resources are used faster than they form. • coal • oil

  8. Renewable resources cannot be used up or can replenish themselves over time. • wind • water • sunlight • Growing use of nonrenewable resources may lead to a crisis. • Resources must be properly managed.

  9. Effective management of Earth’s resources will help meet the needs of the future. • Earth’s resources must be used responsibly. • Careless use of resources makes them unavailable to future generations. • Easter Island isan example ofirresponsibleresource use.

  10. An ecological footprint is the amount of land needed to support a person. • The land must produce and maintain enough • food and water • shelter • energy • waste

  11. amount and efficiency of resource use • amount and toxicity of waste produced • Several factors affect the size of the ecological footprint.

  12. LessonsfromChina • Encourage smaller families by: • 1) Free education for life to one child family • 2) Free birth control • 3) Financial: Salary, Pension, Housing, Medical • 1970s = 5.8 children Today = 1.8

  13. What can you do? • Act locally • Reduce usage of natural resources • Recycle at home • Support Environmental Action Groups (Greenpeace, Sierra Club)

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