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?