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Chapter 27 – Human Impacts on Earth Resources

Chapter 27 – Human Impacts on Earth Resources. Resources and Organisms. The oxygen you breathe in and the carbon dioxide you exhale are examples of natural resources you use everyday Most organisms have adapted to their particular environment and live in balance with it

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Chapter 27 – Human Impacts on Earth Resources

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  1. Chapter 27 – Human Impacts on Earth Resources

  2. Resources and Organisms • The oxygen you breathe in and the carbon dioxide you exhale are examples of natural resources you use everyday • Most organisms have adapted to their particular environment and live in balance with it • Other organisms change the environment to meet their needs • Some positive, some negative

  3. Asian Carp

  4. Carp 1 • Carp 2

  5. Resources and Population Growth • Any type of organism can have an impact if the population becomes too large • As population grows, the demand for resources increases • Population growth is defined as an increase in population size over time

  6. J-shaped Curve • Normally, a growing population can be shown by a J-shaped curve

  7. Limits to Population Growth • Earth’s resources are limited, so population cannot grow forever • Limiting factors can be: food, water, or clean air • Number of organisms an environment can support is its carrying capacity

  8. S shaped curve Carrying capacity

  9. Environmental Factors • Storms, extreme changes in temp, droughts, floods and pollution can all affect population size • Disease, parasites, and lack of food can also affect it

  10. Urban Development • 70% of the North American population live in either urban or suburban areas • Development of land or new construction can cause environment problems • Destroys old habitats • Development also takes away from farmland and adds pressure to remaining farmland • Increase chance of flooding because of increase of asphalt and concrete • Increase in solid waste

  11. Solutions • Developers put barriers around new construction • Modern landfills

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