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Our Environment Through Time

Our Environment Through Time. Periods of Human History that Impacted the Environment. 1) Hunter - Gatherers 2) Agricultural Revolution 3) Industrial Revolution. Hunter - Gatherers. Definition: People who obtain food by collecting plants and hunting wild animals.

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Our Environment Through Time

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  1. Our Environment Through Time

  2. Periods of Human History that Impacted the Environment 1) Hunter - Gatherers 2) Agricultural Revolution 3) Industrial Revolution

  3. Hunter - Gatherers Definition: People who obtain food by collecting plants and hunting wild animals

  4. Hunter - Gatherer's Impact on the Environment 1) Overhunting caused some species of animals to become extinct 2) Destruction of trees and grass (ex: burned down trees to make it easier to hunt bison)

  5. Hunter Gatherers Clip http://www.youtube.com/watch?v=YdYH8m6HOCo

  6. Agricultural Revolution Definition: Growing, breeding, and caring for plants and animals that are used for food, clothing, housing, transportation and other purposes

  7. Pros Increased human population Created domesticated crops out of wild plants Cons Habitats were destroyed to create farmland Soil became infertile due to over use Agricultural Revolution's Impact on the Environment

  8. Industrial Revolution Definition: Shift from energy sources such as animal muscle and running water to fossil fuels such as coal and oil

  9. Pros Less demand for land to farm Cons Air pollution from fossil fuels Invention of non biodegradable materials (plastics) Industrial Revolution's Impact on the Environment

  10. Industrial Revolution's Impact on Society 1) Less expensive to purchase goods 2) Motorized vehicles allowed goods to be shipped across greater distances 3) Improved sanitation, nutrition and medical care

  11. Industrial Revolution Clip http://www.youtube.com/watch?v=6fUBXe7_7Bg

  12. With a partner decide what type of society we live in today (Hunter - Gatherer, Agricultural, or Industrial). List 5 examples that support your choice. Discuss your responses as a class.

  13. Planet Earth The Earth is a CLOSED SYSTEM The following things CANNOT be added to the Earth or its atmosphere • Water • Air • Land • Elements • Ozone Layer

  14. Planet Earth Continued ENERGY is the only thing that can enter and leave the Earth 2 Forms of Energy: 1) Sunlight into Earth 2) Heat leaving Earth

  15. Problems with Earth Being a Closed System 1) Limited natural resources 2) Wastes produced more quickly than we can dispose of them

  16. 3 Main Environmental Problems 1) Resource Depletion 2) Pollution 3) Loss of Biodiversity

  17. Resource Depletion Definition: Any natural material used by humans that is depleting 2 Types of Natural Resources: 1) Renewable 2) Nonrenewable

  18. Renewable Resources Definition: A resource that can be replaced naturally very quickly Examples: Soil Trees

  19. Nonrenewable Resources Definition: A resource that renews at a slower rate than it is consumed Examples: Minerals Fossil Fuels

  20. Pollution Definition: An undesired change in air, water, or soil that adversely affects the health, survival, or activities of humans or other organisms 2 Types of Pollution: 1) Biodegradable Pollutants 2) Nondegradable Pollutants

  21. Biodegradable Pollutants Definition: Pollutants that CAN be broken down by natural processes Examples: Human sewage, Food wastes * CAN BE A PROBLEM if they accumulate quicker than they can be broken down

  22. Nondegradable Pollutants Definition: Pollutants that CANNOT be broken down by natural processes Examples: Mercury, lead and some types of plastics

  23. Loss of Biodiversity Biodiversity Definition: Number and variety of species that live in an area Problem: Extinction of species due to humans

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