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