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1. Humans and the
Environment

2. What is extinction?
 When a species no longer
exists

3. Extinction
 Natural process
 Caused by climate changes,
predators, environmental
factors, and human
involvement

4. Natural Resources
 Resources taken from the
environment
 Renewable resources can be
replaced by nature
 Nonrenewable resources
cannot be replaced

5. Questions
 What is extinction?
 What are some causes of
extinction?
 What is the difference between
renewable and nonrenewable
resources?

6. Pollution
 Making the environment
unclean with wastes
 Gases, chemicals, heat,
garbage, and noise
 Materials that cause pollution
are pollutants

7. Air pollution
 Caused by burning fuels and
trash
 Industries cause such
pollution
 Causes lung disease and acid
rain

8. Water pollution
 Industrial wastes, sewage, and
chemicals dumped into water
supply

9. Soil pollution
 Some is caused by pollutants in
the air or chemical used to
control pests
 Burying toxic wastes can cause
soil pollution as well

10. Consequences of pollution
 Acid rain
 Endangering or extinction of
animals
 Contamination of environment
 Poor air quality
 Disease

11. Questions
 How are the types of pollution
different?
 What is pollution?
 What are some causes of
pollution?

12. Conservation
 Wise use of materials and
energy
 Recycling (reusing) materials
 Decreasing amounts used
 Using alternative forms of
energy and materials

13. Questions
 What are some ways pollution
can affect the environment?
 How can humans reduce
pollution?