For a brief period tonight, some parts of the world will go dark. It's Earth Hour - CNN

1. For a brief period tonight, some parts of the world will go dark. It's Earth Hour  CNN
2. Global landmarks turn off the lights to mark annual Earth Hour  The Guardian
3. World celebrates “Earth Hour” by turning off non-essential lights  CBS Evening News
4. What is Earth Hour? Some parts of the world will power down as part of global movement on March 27  WLS-TV
5. Cities worldwide dim lights to mark Earth Hour  Yahoo News
6. View Full Coverage on Google News

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