Earth Hour - in pictures

Sydney's harbour as the city switches off its lights to mark Earth Hour. The Sydney Opera House was the first of many global landmarks to go dark Photograph: AFP/Getty Images The Melbourne Arts Centre before and after the lights were turned off for Earth Hour Photograph: Mick Tsikas/Reuters N Seoul Tower before and during Earth Hour in Seoul Photograph: Jo Yong-hak/Reuters The National Stadium, also known as the 'Bird's Nest', and the National Aquatics Centre, also known as the 'Water Cube', before and during Earth Hour in Beijing Photograph: David Gray/Reuters Hong Kong's central financial district's Bank of China Tower, Cheung Kong Centre, HSBC headquarters, Standard Chartered Bank and Legislative Council before and during Earth Hour Photograph: Bobby Yip/Reuters Malaysia's Petronas Twin Towers switches off its lights for Earth Hour Photograph: AFP/Getty Images Our Lady of Remedies Parish in Manila has her lights turned off for Earth Hour Photograph: Cheryl Ravelo/Reuters Skyscrapers of Singapore's central business district switch off their lights in a show of support for renewable energy Photograph: Reuters Photograph: Tim Chong/Reuters The Welcome Statue fountain before and during Earth Hour in Jakarta, Indonesia Photograph: Supri/Reuters India Gate in New Delhi, India Photograph: B Mathur/Reuters Parliament House in Islamabad, Pakistan Photograph: Farooq Naeem/AFP/Getty Images The Belarusian National Library in Minsk, Belarus Photograph: Sergei Grits/AP The Ukraina Hotel in Moscow Photograph: Misha Japaridze/AP The Hogalid church and the Ericsson Globe arena in Stockholm Photograph: Scanpix/Reuters The Acropolis in Athens Photograph: Louisa Gouliamaki/AFP/Getty Images The ancient Roman Colosseum in Rome Photograph: Alessandro Di Meo/EPA The Erasmus Bridge in Rotterdam Photograph: Marco De Swart/AFP/Getty Images The Chain Bridge in Budapest, Hungary Photograph: Attila Kisbenedek/AFP/Getty Images Saint Sava cathedral in Belgrade Photograph: Dalibor Danilovic/AFP/Getty Images The Eiffel tower in Paris Photograph: Martin Bureau/AFP/Getty Images Sagrada Familia cathedral in Barcelona Photograph: Alberto Estevez/EPA The Brandenburg Gate in Berlin Photograph: Maurizio Gambarini/EPA The Monument of the Revolution, Mexico City Photograph: Marco Ugarte/AP The Lions Gate Bridge, west Vancouver, British Columbia Photograph: Andy Clark/Reuters The Las Vegas strip Photograph: Ethan Miller/Getty Images Christ the Redeemer in Rio de Janeiro, Brazil Photograph: Felipe Dana/AP