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Earth Hour 2011

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Last Saturday, March 26, people and businesses around the world participated in Earth Hour 2011, turning off their lights at 8:30 p.m. local time. Earth Hour was organized by the World Wildlife Fund in 2007, as a way to bring attention to energy-consumption, sustainability, and climate change issues. This year, participants in 134 countries darkened homes, skyscrapers, and landmarks around the world. The images below (starting with photo number two) are interactive -- click on each image to "turn off the lights" (For wider screens, be sure to click the "1280px" option at right.) [25 photo pairs]

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This combo of photos shows the Seoul N Tower before (left) and after (right) the lights were turned off for Earth Hour in Seoul, South Korea, on March 26, 2011. Global landmarks around the world went dark on March 26 as "Earth Hour" took place with millions of people around the world switching off their lights. (PARK JI-HWAN/AFP/Getty Images)
This combo of photos shows the Seoul N Tower before (left) and after (right) the lights were turned off for Earth Hour in Seoul, South Korea, on March 26, 2011. Global landmarks around the world went dark on March 26 as "Earth Hour" took place with millions of people around the world switching off their lights. (PARK JI-HWAN/AFP/Getty Images)
Lights are put out on the Sydney Harbour Bridge and the Sydney Opera House, at bottom left, in participation of Earth Hour in Sydney, Australia, on March 26, 2011.   [click image to view transition]   (AP Photo/Michelle O'Connor) #
Sheik Zayed Grand Mosque, Abu Dhabi, United Arab Emirates, on March 26, 2011.   [click image to view transition]   (WWF/Waleed Al Temimi) #
The lights go out on the iconic face at Luna Park Sydney, Australia, on Saturday, March 26, 2011.   [click image to view transition]   (AP Photo/Rick Rycroft) #
The skyscrapers of Singapore's central business district are pictured during Earth Hour on March 26, 2011.   [click image to view transition]   (Reuters/Tim Chong) #
Monumen Nasional in Jakarta, Indonesia, during Earth Hour, 2011   [click image to view transition]   (© WWF-Indonesia / Alfonso RENO) #
Piccadilly Circus lights go off in London, UK, during Earth Hour on March 26th, 2011.   [click image to view transition]   (© WWF/ Tristan Fewings) #
The National Stadium (top), also known as the "Bird's Nest", and the National Aquatics Center, also known as the "Water Cube", can be seen during Earth Hour in Beijing, China, on March 26, 2011.   [click image to view transition]   (Reuters/David Gray) #
The Empire State Building is seen during Earth Hour in New York City on March 26, 2011.   [click image to view transition]   (Reuters/Eric Thayer) #
Victoria Harbour panorama in Hong Kong on March 26th, 2011.   [click image to view transition]   (© WWF / Ringo Ma) #
This combination picture shows the lights around Budapest downtown with the oldest Hungarian bridge "The Chain Bridge" and Buda Palace on March 26, 2011.   [click image to view transition]   (Attila Kisbenedek/AFP/Getty Images) #
The Cathedral in Lausanne during Earth Hour on March 26, 2011.   [click image to view transition]   (Reuters/Denis Balibouse) #
The Lions Gate Bridge during Earth Hour in West Vancouver, British Columbia, on March 26, 2011.   [click image to view transition]   (Reuters/Andy Clark) #
The Petronas Twin Towers in Kuala Lumpur, when lights were turned off for Earth Hour March 26, 2011.   [click image to view transition]   (Reuters/Bazuki Muhammad) #
The hill of the Acropolis and the Herodion theatre during Earth Hour in Athens, Greece, on March 26, 2011.   [click image to view transition]   (Reuters/John Kolesidis) #
Gotaplatsen Square and Kungsportsavenyn street during Earth Hour in Gothenburg, Sweden, on March 26, 2011.   [click image to view transition]   (Reuters/Johan Nilsson/Scanpix) #
The Peace Bridge in Tbilisi, Georgia, on march 26th, 2011.   [click image to view transition]   (WWF/Jack Armstrong) #
The Sagrada Familia church designed by architect Antoni Gaudii during the worldwide Earth Hour, in Barcelona, Spain, on Saturday, March 26, 2011.   [click image to view transition]   (AP Photo/Manu Fernandez) #
A view of the Las Vegas Strip during Earth Hour 2011 from the House of Blues Foundation Room inside the Mandalay Bay Resort & Casino on March 26, 2011 in Las Vegas, Nevada.   [click image to view transition]   (Ethan Miller/Getty Images) #
Scotland's Edinburgh Castle before and after the lights were switched off on March 26th, 2011.   [click image to view transition]   (© Maverick Photo Agency) #
The Belarusian National Library during Earth Hour in Minsk, Belarus, on Saturday, March 26, 2011. The monument of Belarusian enlightener Frantsysk Skorina is on the left.   [click image to view transition]   (AP Photo/Sergei Grits) #
Commercial buildings at Hong Kong's central district switch off nonessential lights on March 26, 2011 to mark Earth Hour.   [click image to view transition]   (AP Photo/Kin Cheung) #
The Brandenburg Gate during Earth Hour in Berlin on Saturday, March 26, 2011.   [click image to view transition]   (AP Photo/Markus Schreiber) #
Aldar Headquarters Earth Hour 2011 before and after in Abu Dhabi, UAE, on March 26, 2011.   [click image to view transition]   (© WWF/Chris Joyce) #
The Sydney city skyline on March 23, 2011, during Earth Hour on March 26, 2011.   [click image to view transition]   (Reuters/Tim Wimborne) #

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