Objectives <ul><li>Explain how humans affect the atmosphere </li></ul><ul><li>Provide evidence for climate change </li></u...
Question <ul><li>How does a changing climate affect humans? </li></ul>
Ozone layer <ul><li>From Earth Science, what do you remember about the ozone layer? </li></ul><ul><li>Where is it? </li></...
Ozone layer <ul><li>Ozone Layer: A layer of ozone gas located in the Stratosphere </li></ul><ul><li>Which layer of the atm...
Ozone layer <ul><li>Molecules called CFCs destroy ozone </li></ul><ul><li>CFCs were once used as propellants, in coolants,...
Ozone layer <ul><li>Who has heard of the hole in the ozone layer? What do you know about it? </li></ul><ul><li>Every sprin...
Ozone layer <ul><li>What do you think would be the effect of less ozone in the atmosphere? </li></ul><ul><ul><li>Increased...
Ozone layer <ul><li>In 1987 the use of CFCs was banned </li></ul><ul><li>Since then concentrations of CFCs in the atmosphe...
Global Warming <ul><li>What do you know about global warming? </li></ul><ul><li>What do you think is real? </li></ul><ul><...
Here is what we know <ul><li>These things have been observed and recorded </li></ul><ul><ul><li>The last 2 decades are the...
Here is what we know <ul><li>So, what are humans doing that is causing the globe to warm? </li></ul><ul><li>Carbon Dioxide...
Effects <ul><li>What are the effects of a warmer planet? </li></ul>
Effects <ul><li>More frequent, more intense storms </li></ul><ul><li>Extinction of some animals </li></ul><ul><li>Other an...
Effects <ul><li>Here is a dramatic, but funny take on global warming </li></ul>
Effects <ul><li>We must make a distinction </li></ul><ul><li>Damaging the ozone layer and global warming are not the same ...
Project <ul><li>Get into your groups and work on your project </li></ul>
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How humans affect the atmosphere

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Warming notes

  1. 1. Objectives <ul><li>Explain how humans affect the atmosphere </li></ul><ul><li>Provide evidence for climate change </li></ul><ul><li>Describe consequences associated with ozone depletion and climate change </li></ul>
  2. 2. Question <ul><li>How does a changing climate affect humans? </li></ul>
  3. 3. Ozone layer <ul><li>From Earth Science, what do you remember about the ozone layer? </li></ul><ul><li>Where is it? </li></ul><ul><li>What does it do? </li></ul>
  4. 4. Ozone layer <ul><li>Ozone Layer: A layer of ozone gas located in the Stratosphere </li></ul><ul><li>Which layer of the atmosphere is the stratosphere? </li></ul><ul><li>Ozone gas absorbs UV radiation </li></ul><ul><li>You can think of the ozone layer as the Earth’s sunscreen </li></ul>
  5. 5. Ozone layer <ul><li>Molecules called CFCs destroy ozone </li></ul><ul><li>CFCs were once used as propellants, in coolants, and in making plastic </li></ul>
  6. 6. Ozone layer <ul><li>Who has heard of the hole in the ozone layer? What do you know about it? </li></ul><ul><li>Every spring CFC concentrations become high in the atmosphere over the Arctic </li></ul><ul><li>The CFCs destroy ozone causing a hole in the ozone above the Arctic </li></ul>
  7. 7. Ozone layer <ul><li>What do you think would be the effect of less ozone in the atmosphere? </li></ul><ul><ul><li>Increased skin cancer </li></ul></ul><ul><ul><li>Eye damage </li></ul></ul><ul><ul><li>Harms amphibians and their eggs </li></ul></ul><ul><ul><li>Too much UV can harm plants </li></ul></ul>
  8. 8. Ozone layer <ul><li>In 1987 the use of CFCs was banned </li></ul><ul><li>Since then concentrations of CFCs in the atmosphere have been falling </li></ul>
  9. 9. Global Warming <ul><li>What do you know about global warming? </li></ul><ul><li>What do you think is real? </li></ul><ul><li>What do you think is hype? </li></ul>
  10. 10. Here is what we know <ul><li>These things have been observed and recorded </li></ul><ul><ul><li>The last 2 decades are the warmest on record </li></ul></ul><ul><ul><li>The polar ice caps are getting smaller </li></ul></ul><ul><ul><li>Sea levels are rising </li></ul></ul><ul><ul><li>Storms are becoming more frequent </li></ul></ul>
  11. 11. Here is what we know <ul><li>So, what are humans doing that is causing the globe to warm? </li></ul><ul><li>Carbon Dioxide and other greenhouse gases prevent heat from leaving the atmosphere </li></ul><ul><li>Humans burning things (especially fossil fuels)releases greenhouse gases </li></ul>
  12. 12. Effects <ul><li>What are the effects of a warmer planet? </li></ul>
  13. 13. Effects <ul><li>More frequent, more intense storms </li></ul><ul><li>Extinction of some animals </li></ul><ul><li>Other animals moving into new areas </li></ul><ul><li>Increased droughts </li></ul><ul><li>Loss of land to a rising sea </li></ul><ul><li>Can you think of any others? </li></ul><ul><li>Consider this ... </li></ul>
  14. 14. Effects <ul><li>Here is a dramatic, but funny take on global warming </li></ul>
  15. 15. Effects <ul><li>We must make a distinction </li></ul><ul><li>Damaging the ozone layer and global warming are not the same thing </li></ul><ul><li>How are they different? </li></ul><ul><li>Loss of ozone leads to more UV radiation </li></ul><ul><li>The addition of greenhouse gases traps heat </li></ul><ul><li>UV radiation doesn’t cause heat </li></ul>
  16. 16. Project <ul><li>Get into your groups and work on your project </li></ul>

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