Humans and the Environment

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Humans and the Environment
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What is extinction?

• When a species no longer exists

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Extinction

• Natural process
• Caused by climate changes, predators,
  environmental factors, and human involvement

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Natural Resources

• Resources taken from the environment
• Renewable resources can be replaced by nature
• Nonrenewable resources cannot be replaced

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Questions

• What is extinction?
• What are some causes of extinction?
• What is the difference between renewable and
  nonrenewable resources?

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Pollution

• Making the environment unclean with wastes
• Gases, chemicals, heat, garbage, and noise
• Materials that cause pollution are pollutants

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Air pollution

• Caused by burning fuels and trash
• Industries cause such pollution
• Causes lung disease and acid rain

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Water pollution

• Industrial wastes, sewage, and chemicals dumped
  into water supply

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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

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Consequences of pollution

• Acid rain
• Endangering or extinction of animals
• Contamination of environment
• Poor air quality
• Disease

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Questions

• How are the types of pollution different?
• What is pollution?
• What are some causes of pollution?

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Conservation

• Wise use of materials and energy
• Recycling (reusing) materials
• Decreasing amounts used
• Using alternative forms of energy and materials

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Questions

• What are some ways pollution can affect the
  environment?
• How can humans reduce pollution?