Earth Hour calls on people to turn off their non-essential lights for one hour. “地球一小时”活动号召人们熄灯1小时。 地球一小时（Earth Hour）是世界自然基金会（WWF）提出的倡议，呼吁大家每年3月最后一个星期六20：30-21：30熄灯一小时，来表明对应对气候变化行动的支持。2012年3月31日20:30-21:30我们一起熄灯支持环保！
Earth Hour is a worldwide event organized by the World Wide Fund for Nature (WWF) and held on the last Saturday of March annually, encouraging households and businesses to turn off their non-essential lights for one hour to raise awareness about the need to take action on climate change. The event, conceived by WWF and The Sydney Morning Herald, first took place in 2007, when 2.2 million residents of Sydney participated by turning off all non-essential lights.[1] Following Sydney's lead, many other cities around the world adopted the event in 2008.[2][3] Earth Hour 2012 took place on 31 March 2012 from 8:30 p.m. to 9:30 p.m., at participants' local time.
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