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
The Melbourne Arts Centre before and after the lights were turned off for Earth Hour
N Seoul Tower before and during Earth Hour in Seoul
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
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
Malaysia's Patronas Twin Towers switches off its lights for Earth Hour
Lady of Remedies in Paris has her lights turned off for Earth Hour
Skyscrapers of Singapore's central business district switch off their lights in a show of support for renewable energy
The Welcome Statue fountain before and during Earth Hour in Jakarta, Indonesia
The Belarusian National Library in Minsk, Belarus
The Ukraina Hotel in Moscow
The Hogalid church and the Ericsson Globe arena in Stockholm
The Acropolis in Athens
The ancient Roman Colosseum in Rome
The Erasmus Bridge in Rotterdam
The Chain Bridge in Budapest, Hungary
Saint Sava cathedral in Belgrade
The Eiffel tower in Paris
Sagrada Familia cathedral in Barcelona
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