What is Earth Hour?
Earth Hour is organized by the World Wide Fund for Nature (WWF) and it's a big event usually at the end of March every year. On this evening, people 'go dark' – that is, switch off lights in their homes, schools and businesses all at the same time for one hour.
Earth Hour started in Australia in 2007, when 2.2 million people in Sydney turned off all unnecessary lights for an hour. Since then it has grown into an international event, and many countries around the world have taken part. Famous buildings that have gone dark for Earth Hour include the Sydney Opera House and Harbour Bridge, the Petronas Towers in Kuala Lumpur, the Houses of Parliament and Buckingham Palace in London, the Eiffel Tower in Paris, the Forbidden City in Beijing and New York's Empire State Building. Even astronauts on the International Space Station have taken part by reducing their power use on the station, and Google has shown its support by making a dark homepage for the event.
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