地球一小时（英语：Earth Hour）是一个全球性节能活动，从2007年开始的“地球一小时”，召唤全球几亿人，在每年3月的最后一个周六的晚上20:30-21:30熄灭灯光。地球一小时始于澳大利亚，并迅速席卷全球。活动旨在于提高市民的环保意识，减缓气候变化。

     "Earth Hour" is a global energy conservation activity. Since 2007 "Earth Hour" has called billions of people from the world to turn off lights at 20:30-21:30 on last Saturday night of March each year. "Earth Hour" started in Australia, and quickly swept the world. Its purpose is to raise people's environmental awearness and slow down climate change.