will u switch the light for one hour today?

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I was told by my classmate that today is a day for the world to switch light for one hour between 8:30 pm to 9:30 pm in China.I don't know if you have ever heared about this activity ,which was initiated by Australia in 2007 .If not,u may search it in google by the key words of "switch" "light" This activity has grown from a event in a city of australia to the worldwide movement ,showing it really has some infuluence on people's awareness of resource limitation and inviromental protection.So let us join this activity and make practical action to proctect our sole home the earth!