Onlookers watch Taipei 101 building as it turns its lights off to observe international "Earth Hour" campaign, Saturday, March 23, 2013, in Taipei, Taiwan. Around 100 people gathered outside the skyscraper Saturday, using energy saving LED lights to observe the global event that encourages people to turn off their lights for 60 minutes. (AP Photo/Wally Santana)
Saturday, March 23, 2013 4:29 pm
AP Photos: Cities go dark for 'Earth Hour'
The Associated PressAssociated Press
In more than 7,000 cities and towns across the planet, millions of residents are turning off their lights for an hour from 8:30 to 9:30 p.m. local time to show their environmental concern.
Here are some photos of "Earth Hour" observances.