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Last year, in a program promoted by the World Wildlife Fund and Sydney, Australia, Sydney turned off all of its lights for one hour.  The effort was an attempt to draw attention to responsible energy use and the issue of global warming.

This year the WWF is asking us to do so around the world.  An hour of darkness doesn't seem too much to ask. If you'd like to participate, turn off your lights between 8 and 9 PM on Saturday, your own local time. Learn more from the Earth Hour web site .