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Photos: 2011

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  1. This combo shows the lights around Sydney's Harbor and the iconic Opera House (L) taken on March 23, 2011 (top photo) and on March 26, 2011 as the city switches off its lights to mark "Earth Hour". Australia's Opera House was the first of many global landmarks to go dark on March 26 as "Earth Hour" got underway with hundreds of millions of people around the world set to switch off their lights. (Drina Thurston / AFP - Getty Images) Back to slideshow navigation
  2. This combo of photos shows the Seoul N Tower before (L) and after (R) the lights were turned off for Earth Hour in Seoul on March 26. (Park Ji-hwan / AFP - Getty Images) Back to slideshow navigation
  3. Participants form a Korean character, which reads "Night", with candles before Earth Hour in front of N Seoul Tower in Seoul on March 26. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Jo Yong-hak / Reuters) Back to slideshow navigation
  4. A combination photograph shows the National Stadium (top), also known as the "Bird's Nest", and the National Aquatics Center, also known as the "Water Cube", before and during Earth Hour in Beijing March 26. (David Gray / Reuters) Back to slideshow navigation
  5. Volunteers participate in a "Save the Earth" display during a "wayang kulit" -- a Malay traditional shadow puppet performance, after lights were turned off for Earth Hour in Kuala Lumpur on March 26. (Stringer/malaysia / Reuters) Back to slideshow navigation
  6. In this composite image of two photos lights are out on the iconic face at Luna Park in the top photo in participation of Earth Hour minutes after the bottom was taken with the lights on in Sydney on March 26. (Rick Rycroft / AP) Back to slideshow navigation
  7. This combo shows the before and after views of the Taipei 101 building as Taipei marks "Earth Hour" on March 26. (Sam Yeh / AFP - Getty Images) Back to slideshow navigation
  8. These combo photos show a general view of commercial buildings before, top, and after, bottom, turning off lights at Hong Kong's central district on March 26 to mark the annual Earth Hour. (Kin Cheung / AP) Back to slideshow navigation
  9. Mark Morgenroth, from Massachusetts, and Katharine Gilmour, from Britain, hold candles during Earth Hour after lights were turned off in part of central Amman on Saturday. (Ali Jarekji / Reuters) Back to slideshow navigation
  10. A composite picture shows the Basilica of Superga before and during Earth Hour in Turin, Italy on Saturday. (Di Marco Ansa / EPA) Back to slideshow navigation
  11. This combination of images shows Malaysia's iconic land mark Patronas Twin Towers seconds before (L) and after (R) the lights were switched off for Earth Hour in Kuala Lumpur on Saturday. (Saeed Khan / AFP - Getty Images) Back to slideshow navigation
  1. Editor's note:
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  2. Editor's note:
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  3. Editor's note:
    This image contains graphic content that some viewers may find disturbing.

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  1. Image: This combo shows the lights around Sydne
    Drina Thurston / AFP - Getty Images
    Above: Slideshow (11) Lights out - 2011
  2. Image:
    Greg Wood / AFP - Getty Images
    Slideshow (9) Lights out - 2010
  3. Earth hour
    Mast Irham / EPA
    Slideshow (16) Lights out - 2009
  4. A man smoke a cigarette in front of his
    Gabriel Bouys / AFP/Getty Images
    Slideshow (8) Warming refugees?
  5. Frederick Deligne / Politicalcartoons.com
    Slideshow (6) What Global Warming?

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