The World Wildlife Fund's (WWF) Earth Hour is an annual global
event held on the last Saturday of March, in which participants
turn off non-essential electrical appliances for an hour in
order to raise awareness on climate change. This picture
provided by Commonwealth Edison shows buildings in downtown
Chicago darkened during Earth Hour 2009 on Saturday, March 28,
2009. The Wrigley Building is seen at center. Eric Y.
Exit/Commonwealth Edison/AP WWF activists stood with candles as
The Rialto Bridge lights are turned off, in Venice, Italy,
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 Earth
Hour, a time zone-by-time zone plan to dim nonessential lights
between 8:30 p.m. and 9:30 p.m. People ride pushed bikes fitted
with custom-made electric generators in Melbourne, Australia,
Saturday, March 28, marking Earth Hour 2009. Called Future
Spark, the activity ran from March 23 to the 28, f