The teacher begins by explaining the terms of light and pollution. You can choose however you want to bring up the idea of lights and pollution, but the students must understand the concepts in order for the webquest to be effective. Explain the importance of keeping our nations clean and include with that the sky (something that might work would be a story about being able to see the sky when you are in the country and the lack of stars when you are in the city). When thinking of how to put together the lecture for this unit, I would use something that is similar to this. This one is derived straight from Wikipedia.org.

• 1 Impact on energy usage
• 2 Types of light pollution
  
  • 2.1 Light trespass
    
  • 2.2 Over-illumination
    
  • 2.3 Glare
    
  • 2.4 Clutter
    
  • 2.5 Sky glow
    
• 3 Measurement of light pollution and global effects
  
• 4 Consequences of light pollution
  
  • 4.1 Energy waste
    
  • 4.2 Effects on human health and psychology
    
  • 4.3 Disruption of ecosystems
    
  • 4.4 Loss of safety
    
  • 4.5 Effect on astronomy
    
• 5 Reducing light pollution
  
  • 5.1 Improving lighting fixtures
    
  • 5.2 Adjusting types of light sources
    
  • 5.3 Re-designing lighting plans
    
• 6 Notes and references
  
• 7 See also
  
• 8 External links
  
  • 8.1 Related Organizations
    
  • 8.2 Research about light pollution
    
  • 8.3 Collections of links related to light pollution