Our Environment Through Time

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?vYdYH8m6HOCo

6
Agricultural Revolution

• Definition
• Growing, breeding, and caring for plants and
  animals that are used for food, clothing,
  housing, transportation and other purposes

7
Agricultural Revolution's Impact on the
Environment

• 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

8
Industrial Revolution

• Definition
• Shift from energy sources such as animal muscle
  and running water to fossil fuels such as coal
  and oil

9
Industrial Revolution's Impact on the Environment

• Pros
• Less demand for land to farm

• Cons
• Air pollution from fossil fuels
• Invention of non biodegradable materials
  (plastics)

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?v6fUBXe7_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

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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

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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