1. List the 4 things that show the Evidence of a Warming Earth?
Bell Ringer
List the 4 things that show the Evidence of a Warming Earth? 1. 2. 3. 4.

2. Think Pair Share
The person sitting next to you, push your desk together, in pairs ONLY (2).
The topic is Pollution in the Earth’s Atmosphere pg. ( ) Read over it and on your bell ringer paper, write out what you think causes pollution, where it comes from, and how it affects us .
You all have 5 minutes to write down and discuss the different types of pollution into the Earth’s Atmosphere
Every person in each group will present their findings, randomly.

3. Lesson 15.1 Earth’s Atmosphere
The air we breathe and all the weather we see is contained in the lowest 1% of the Earth’s atmosphere.

4. Properties of the Atmosphere
Lesson 15.1 Earth’s Atmosphere
Properties of the Atmosphere
Composition: 78% nitrogen, 21% oxygen, and 1% other gases
Temperature: Varies and location
Pressure: In general, air pressure decreases with altitude; can be measured using a barometer.
Barometer

5. Layers of Atmosphere Troposphere: 0–11 km; movement of air, weather
Lesson 15.1 Earth’s Atmosphere
Did You Know? The stratosphere and mesosphere are cold, but the upper thermosphere can be hotter than 1500°C.
Layers of Atmosphere
Troposphere: 0–11 km; movement of air, weather
Stratosphere: 11–50 km; ozone layer, absorbs and scatters UV rays
Mesosphere: 50–80 km; meteoroids burn up
Thermosphere: 80+ km; disturbances produce aurora borealis

6. Lesson 15.2 Pollution of the Atmosphere
Air pollution is estimated to cause 2 million premature deaths worldwide every year.

7. Types of Air Pollutants
Lesson 15.2 Pollution of the Atmosphere
Types of Air Pollutants
Primary air pollutants: Released directly into the atmosphere; example: soot
Secondary air pollutants: Formed when primary pollutants react chemically with other substances; example: sulfuric acid

8. Smog A mix of air pollutants that forms over cities
Lesson 15.2 Pollution of the Atmosphere
Smog
A mix of air pollutants that forms over cities
“Smog” is a combination of the words smoke and fog.
Industrial smog (soot, sulfur, and water vapor) comes from industrial sources.
Photochemical smog is mostly tropospheric ozone created when primary pollutants from vehicle exhaust react to sunlight.

9. Lesson 15.2 Pollution of the Atmosphere
Acid Deposition
Sulfur dioxide and nitrogen oxides can react with water, oxygen, and other chemicals to form acids.
Acid falls as particles or dissolves in precipitation, lowering the pH of rain and snow.
Acid deposition harms forest and lakes and damages human structures.
Did You Know? Rainwater is naturally acidic (pH 5.6), but acid precipitation in some parts of the U.S. has a pH as low as 4.

10. Lesson 15.3 Controlling Air Pollution
Since the Clean Air Act was first enacted in 1963, emissions of the worst pollutants in the U.S. have decreased by 57%.

11. Lesson 15.3 Controlling Air Pollution
The Clean Air Act
First passed in 1963 to protect human and environmental health by improving air quality; has been revised several times
Limits emissions of pollutants, sets standards for air quality, establishes a legal framework for suing industries that break the rules, and provides funding for pollution control

12. Major Accomplishments of the Clean Air Act
Lesson 15.3 Controlling Air Pollution
Major Accomplishments of the Clean Air Act
Catalytic converters, present in all cars since 1975, have reduced vehicle emissions.
Lead has been phased out of gasoline.
Industries and power plants have reduced releases of pollutants by using scrubbers, which remove or alter chemicals before they leave factory smokestacks.
Did You Know? The removal of lead from gasoline has led to a 99% reduction in lead emissions since 1973.

13. Lesson 15.3 Controlling Air Pollution
The Ozone Hole
Ozone is a pollutant in the troposphere, but in the stratosphere it creates a protective barrier against UV radiation.
Chemicals called chlorofluorocarbons, which used to be found in everything from aerosol cans to refrigerators, have destroyed ozone, causing an “ozone hole” to form over Antarctica.
An ozone hole allows more UV radiation to reach Earth’s surface, potentially increasing cases of skin cancer.
Aerosol spray can

14. Recovery of the Ozone Layer
Lesson 15.3 Controlling Air Pollution
Recovery of the Ozone Layer
The Montreal Protocol is an international treaty signed in 1987 that has cut CFC production by 95% since the 1980s.
Ozone levels in the stratosphere have begun to stabilize, and the ozone hole will likely start to disappear.
Ozone Hole 1979
Ozone Hole 2000

15. Individual Work
Page 468
1-5
Page 473
1-3
Page 460
1-4
Due by end of class

16. List the 4 things that show the Evidence of a Warming Earth?
Bell Ringer
List the 4 things that show the Evidence of a Warming Earth?
1. Rising global surface temperatures
2. Changes in precipitation patterns
3. Melting ice (glaciers, polar ice)
4. Rising sea level