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Have you heard of Earth Hour? It's a campaign that encourages people around the world to switch off1at the same time for one hour. Earth Hour started In2in 2007 when over 2. 2 million families and companies in the city of Sydney3all unimportant lights for an hour. Since then it has developed into a big global event. In 2013, millions of people in 7,000 cities and towns around the world switched off their lights for4minutes at the end of March. Every year landmarks and well 一 known5around the world such as the Sydney Opera House and Harbour Bridge, the Petronas Towers in Malaysia, the UK Parliament, Buckingham Palace and the Empire State Building6and "go dark" for Earth Hour. The campaign even went into space when7reduced power on the International Space Station in 2011.
Earth Houris8by the World Wide Fund for Nature (WWF). It was started by Andy Ridley, originally from Britain, who is executive director of Earth Hour Global, WWF. He9the idea of Earth Hour because he wanted to raise awareness of environmental issues10asking people to do something positive to help the planet. Switching off the lights for an hour can make a small11to the amount of energy we use but Earth Hour is also a symbolic event to12people think about the problems of climate change.
