light pollution

Hello muimuimic2002 ~

Actually, you may refer to some useful information in the Internet :

http://en.wikipedia.org/wiki/Light_pollution

Especially the column of "Reduction":

http://en.wikipedia.org/wiki/Light_pollution#Reduction

‧You may switch off the light when it is unnecessary to be used.

‧We may use some other lamps to replace the lamb that we used nowadays.

The websites provide a lot of information that can help you. You must go and take a look of them!

Hope that it will be helped ~~~~~

switch off the light when we do not use them.