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A look at how the environment initative was recognized

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People hold candles as they gather outside the Galileo Galilei planetarium to observe Earth Hour in Buenos Aires, March 29.

Marcos Brindicci/Reuters

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Students and visitors hold torches as they observe Earth Hour outside Fleming College's Frost Campus for Environmental Studies in Lindsay, Ont.

Fred Thornhill/Reuters

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Candles placed by participants to create the number 60, representing the minutes in an hour, marking Earth Hour in La Paz, Bolivia.

Juan Karita/AP

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People hold candles as they watch a performance during Earth Hour in Sao Paulo.

Paulo Whitaker/Reuters

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Saudis gather in a park during celebrations to mark the worldwide Earth Hour in Riyadh, Saudi Arabia.

Hasan Jamali/AP

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The "Puente Nuevo" (New Bridge) is seen during Earth Hour in Ronda, near Malaga, Spain.

Jon Nazca/Reuters

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The UNESCO World Heritage Cologne Cathedral and the Hohenzollern railway bridge along the river Rhine are seen during Earth Hour.

Ina Fassbender/Reuters

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The Old Bridge is pictured during Earth Hour in Mostar.

Dado Ruvic/Reuters

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The lights are turned off at the Kremlin during the worldwide Earth Hour in Moscow.

Denis Tyrin/AP

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Times Square is pictured during Earth Hour in New York.

Eduardo Munoz/Reuters

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