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Earth Hour
地球一小时
Earth Hour started in 2007 in Sydney, Australia.
地球一小时（活动）起始于 2007 年澳大利亚悉尼。
In that year, 2.2 million people turned their lights off for one hour.
就在这一年，220 万人将他们的灯关闭了一小时。
They did this to show that they cared about climate change.
他们这样做是为了证明他们关心气候变化。
Since then, people from all over the world do the same on the last Saturday of March every year.
从那时起，在每年的 3 月的最后一个星期六，来自世界各地的人们都这样做。
More and more countries are joining Earth Hour.
越来越多的国家正在加入地球一小时（活动）。
