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What do you think this means?
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Causes and Effects of Pollution
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Learning Targets8. Identify the causes and effects of
pollution on Earth’s cycles.
9. Explain how pollution affects the environmental quality.
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Are these statements true?
1. Greenhouse gases absorb visible light.
~ FALSE
Greenhouse gases absorb infrared radiation.
2. The ozone layer is found in the troposphere.
~ FALSE
The ozone layer is found in the stratosphere.
3. Greenhouse gases include carbon dioxide and water vapor.
~ TRUE
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What is air pollution?
Smoke and other harmful materials that are added to the air.
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Causes of Pollution
• Gas Pollutants:– Carbon monoxide– Methane– Ozone– Sulfur oxides– Nitrogen oxide
Some of these gases are considered pollutants only when they are likely to cause harm.
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Causes of Pollution
• Particle Pollutants– Particulates (tiny particles or droplets that are
mixed in with air)– Smoke– Dust, dirt, pollen, salt from the ocean (picked up
by wind)
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Causes of pollution
• Burning Fossil Fuels– Fuels formed from the remains of prehistoric
animals and plants• Oil, gasoline and coal
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Causes of Pollution
• Smog– Combination of smoke and fog– Sunlight causes the fumes from gasoline, car
exhaust and other gases to react chemically.
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Effects of Pollution• Health Problems
– Irritation of: eyes, nose, throat, lungs– Lung disease– Asthma
• Damage to– Plants– Buildings– Outdoor objects
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Attempts to Control Pollution
• Clean Air Act– Limits the amount of air pollution that
factories and power plants are allowed to release.
– Sets rules for making car exhaust cleaner.
• The Environmental Protection Agency– Measures air pollution and works to enforce
the laws passed by Congress.
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Greenhouse Gases are GOOD
Help keep temperatures
within a range that is
suitable for the plants
and animals to live on
Earth.
BUT….
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HUMAN ACTIVITIES ARE
INCREASING GREENHOUSE
GASES!
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Greenhouse Gases• Carbon Dioxide (CO2)• Methane (CH4)• Nitrous Oxide (N2O)
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Carbon DioxideComes from the use of fossil fuels in power plants, cars, factories and homes
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MethaneComes from cattle and other livestock, bacteria in rice fields, and landfills (waste disposal)
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Nitrous Oxide
Comes from fertilizers and chemical factories.
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More Greenhouse Gases
Increases Temperature
Affects plant growth and processes that produce or reduce greenhouse gases.
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What is Global Warming?
An increase in the Earth’s average temperature.
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Did you know?Carbon Dioxide can stay in the atmosphere for
more than 100 years.The air contains 30% more carbon dioxide
than it did in the mid-1700’s.The level of carbon dioxide is now increasing
about 0.4% each year.
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Effects of Global Warming
• Negatively affect sources of food
• Amount of water available• Amount of resources
available• Human heath