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A picture taken on March 23, 2013 shows Vilnius’ town hall with the light switched off during the annual Earth Hour event in Vilnius, Lithuania. Millions of people were expected to switch off their lights for Earth Hour in a global effort to raise awareness about climate change. Since it began in Sydney in 2007, Earth Hour has grown to become what environmental group WWF says is the world’s largest demonstration of support for action on carbon pollution. AFP PHOTO / PETRAS MALUKAS