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1. 
When light shines into an area where it is not wanted or needed
2. 
When the light is very bright and your eyes hurt.
3. 
When there is a yellow halo around an inhabited area.
4. 
The excessive use of outdoor artificial light.
5. 
Mountains affect the amount of rain that some areas receive.
6. 
The higher about sea level you go, the cooler it gets.
7. 
Places along the coast have milder temperatures.
8. 
Places near the Equator have warmer climates.