Learning Targets 8. Identify the causes and effects of pollution on Earth’s cycles. 9. Explain how pollution affects the environmental quality.
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
What is air pollution? Smoke and other harmful materials that are added to the air.
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.
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)
Causes of pollution Burning Fossil Fuels – Fuels formed from the remains of prehistoric animals and plants Oil, gasoline and coal
Causes of Pollution Smog – Combination of smoke and fog – Sunlight causes the fumes from gasoline, car exhaust and other gases to react chemically.
Effects of Pollution Health Problems – Irritation of: eyes, nose, throat, lungs – Lung disease – Asthma Damage to – Plants – Buildings – Outdoor objects
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.
Greenhouse Gases are GOOD Help keep temperatures within a range that is suitable for the plants and animals to live on Earth. BUT….
What is Global Warming? An increase in the Earth’s average temperature.
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.