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?