Humans and the
Environment
What is extinction?

When a species no longer
exists
Extinction
Natural process
 Caused by climate changes,
predators, environmental
factors, and human
involvement

Natural Resources
Resources taken from the
environment
 Renewable resources can be
replaced by nature
 Nonrenewable resources
cannot be replaced

Questions
 What is extinction?
 What are some causes of
extinction?
 What is the difference between
renewable and nonrenewable
resources?
Pollution
 Making the environment
unclean with wastes
 Gases, chemicals, heat,
garbage, and noise
 Materials that cause pollution
are pollutants
Air pollution
Caused by burning fuels and
trash
 Industries cause such
pollution
 Causes lung disease and acid
rain

Water pollution

Industrial wastes, sewage, and
chemicals dumped into water
supply
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

Consequences of pollution
Acid rain
 Endangering or extinction of
animals
 Contamination of environment
 Poor air quality
 Disease

Questions
How are the types of pollution
different?
 What is pollution?
 What are some causes of
pollution?

Conservation
Wise use of materials and
energy
 Recycling (reusing) materials
 Decreasing amounts used
 Using alternative forms of
energy and materials

Questions
What are some ways pollution
can affect the environment?
 How can humans reduce
pollution?
