地球一小時

這是澳洲雪梨在去年（2007）發起的活動，迅速獲得全球人士響應。2007年3月31日，超過二百千萬雪梨居民、2100商家，一起關燈一小時，當天減少了該城市10.2%的電力使用。

轉載：
On March 31 2007, for one hour, Sydney made a powerful statement about the greatest contributor to global warming – coal-fired electricity – by turning off its lights. Over 2.2 million Sydney residents and over 2,100 businesses switched off, leading to a 10.2% energy reduction across the city. What began as one city taking a stand against global warming caught the attention of the world.

>官方網站：http://www.earthhour.org/