The Empire State Building as seen from the Top of the Rock at Rockefeller Center March 28, 2009 moments after it went dark at 8:30 p.m. as individuals and organizations turn off non-essential lighting for one hour in a call to action for climate change during World Wildlife Fund's Earth Hour 2009. AFP PHOTO/ TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Wednesday, Apr 15, 2009 Updated at 4:01 PM EDT
Ever doubt the power of an idea? Ever wonder if the small things matter?
Earth Hour was a simple idea. Turn off your lights for one hour on March 28 to raise awareness about climate change.
About 4,000 cities in 88 countries participated. Please click here to see how the darkness spread around the world, bringing with it a new light.