SLIDESHOW: Earth Hour

1 of 8: An Indonesian family sits near candles as lights are turned off during a candlelight vigil marking Earth Hour at the main business district in Jakarta, Indonesia, Saturday, March. 28, 2009. From the Great Pyramids to the Acropolis, the London Eye to the Las Vegas strip, nearly 4,000 cities and towns in 88 countries planned to join in the World Wildlife Fund-sponsored event, a time zone-by-time zone plan to dim nonessential lights between 8:30 p.m. and 9:30 p.m. (AP Photo/Dita Alangkara)