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Sun 27 Mar 2011 03:44 PM

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Lights out: Earth Hour across the globe

Hundreds of landmark buildings and millions of homes switch off their lights in the world's largest voluntary action for the environment

Lights out: Earth Hour across the globe
An Indian women holds a lighted candle during an Earth Hour campaign in Mumbai on March 26, 2011. Dozens of Indians lit candles to observe Earth Hour and called for voluntary action against climate change. (AFP/Getty Images)
Lights out: Earth Hour across the globe
People attend a candle light vigil at Ciudad del Rio park as they stand in the dark during the Earth Hour on March 26, 2011, in Medellin, Antioquia Department, Colombia. (AFP/Getty Images)
Lights out: Earth Hour across the globe
People attend a candle light vigil at Ciudad del Rio park as they stand in the dark during the Earth Hour on March 26, 2011, in Medellin, Antioquia Department, Colombia. (AFP/Getty Images)
Lights out: Earth Hour across the globe
Colosseum in Rome without lights during Earth Hour Day, a global event organized by the World Wildlife Fund (WWF), on March 26, 2011. (AFP/Getty Images)
Lights out: Earth Hour across the globe
Lights iluminating the Bernini fountain at Navona square in Rome, are turned off to mark the annual 'Earth Hour', a global event organized by the World Wildlife Fund (WWF), on March 26, 2011. (AFP/Getty Images)
Lights out: Earth Hour across the globe
The Brandenburg Gate is seen before the lights are switched off for Earth Hour on March 26, 2011 in Berlin, Germany. Earth Hour encourages individuals around the world to turn off their lights for one hour at 20:30 local time to take a stand against climate change. The largest Earth Hour was in 2010 when 128 countries participated. (Getty Images)
Lights out: Earth Hour across the globe
Pakistani people gather in front of the parliament house where are displayed candles during an Earth Hour in Islamabad on March 26, 2011. The lights switched off around the world for Earth Hour to stress the need to save energy, show concern over global warming and preserve environment for a better future. (AFP/Getty Images)
Lights out: Earth Hour across the globe
The Tianyi Square is seen during the Earth Hour 2011 power switch off on March 26, 2011 in Ningbo, Zhejiang Province of China. About 86 Chinese cities joined a WWF worldwide initiative Earth Hour, to call on people to switch off unnecessary lights for one hour tonight, in support for energy-saving efforts and global warming prevention as a shared responsibility. (Getty Images)
Lights out: Earth Hour across the globe
People light the candles during the Earth Hour 2011 power switch off on March 26, 2011 in Zhuji, Zhejiang Province of China. A(Getty Images)
Lights out: Earth Hour across the globe
Traffic travels around the Malaysia's iconic land mark Patronas Twin Towers as lights start switching off for Earth Hour in Kuala Lumpur, on March 26, 2011. (AFP/Getty Images)