01/11/2009 05:12 am ET Updated Dec 06, 2017

Earth Hour: An Hour Of Darkness For The Planet (VIDEO)

The World Wildlife Fund has announced that Chicago, Las Vegas, Los Angeles, Miami, Nashville, and San Francisco would lead the list of U.S. cities committed turn off the lights for one hour on March 28, 2009 at 8:30 p.m.. These cities will join 62 countries in "going dark" for Earth Hour. WWF officials hope that Earth Hour will reach more than a billion people worldwide, and will serve to inspire citizens and politicians to act swiftly to stem climate change.

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