1. 5B Tsoi Ka Ngo 5B Leung Tsz Chun 5B Li Cheuk Yin

2. What is light pollution? a kind of pollution any adverse effects as a result of man-made lights Common sources: billboards, neon lights, company logos

3. Light pollution in Hong Kong  A light pollution study  Tsim Sha Tsui - 1200 times brighter than a normal dark sky.

4.  The brightness in Sai Kung is still 20 times the standard.

5. CNN News Report

6. Problems of light pollution  Global warming  Adverse effects on humans  Harmful to wildlife

7. Global Warming  The electric spotlights and billboards consume a lot of power  The burning of fossil fuels increases

8.  More carbon dioxide is emitted  More serious global warming  Are the lights still necessary after midnight?

9. Adverse effects on humans  Disrupting the biological clock of humans  Causing sleep problems e.g. insomnia

10.  Affecting people’s brain and hormone function  Mental illnesses  Increasing the risk of breast cancer

11. Harmful to wildlife  Many migratory birds migrate at night  They rely on the moon and star to find their way  The artificial lights confuse the birds  They may get lost or collide with each other

12.  Affecting the breeding of fireflies in Hong Kong  They rely on light signals to mate

13. Solutions  The government should introduce light pollution regulations as soon as possible  Controlling the lighting hours  Controlling the light intensity  Controlling the direction of lighting

14.  Education is also important  More promotion is needed to increase the awareness of light pollution in Hong Kong  School, TV, the Internet

15. What can you do?  You can lower the amount of light pollution by having lights off when they are not needed.  Earth Hour  Saturday 29 March  8.30PM - 9.30PM