8. Greenhouse gases

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Across
  1. 3. (Trapping heat on Earth's surface)
  2. 6. (Greenhouse gases are specific types of molecules)
  3. 8. (Warming can release more greenhouse gases)
  4. 11. (How greenhouse gases trap infrared radiation)
  5. 12. (Fuels are a major source of CO2 emissions)
  6. 13. (CFCs were commonly used as refrigerants)
  7. 14. (Molecular vibrations allow IR absorption)
  8. 16. (Human-caused sources of greenhouse gases)
  9. 17. (Potent greenhouse gas from agriculture)
  10. 19. (Greenhouse molecules must have a changing dipole moment)
  11. 20. (Efforts to reduce climate change impacts)
Down
  1. 1. (Dioxide is a major greenhouse gas)
  2. 2. (Also contributes to increased CO2 levels)
  3. 4. (Reducing carbon emissions)
  4. 5. (Forcing measures greenhouse gas warming effect)
  5. 7. (Where CFCs contribute to ozone depletion)
  6. 9. (Agreement aimed at reducing emissions)
  7. 10. (Type of radiation absorbed by greenhouse gases)
  8. 15. (Oxide, a greenhouse gas)
  9. 18. (Determining a greenhouse gas's climate impact)