A few months ago, TreeHugger Mark Ontkush wrote a post on his blog EcoIron titled 'Black Google Would Save 750 Megawatt-hours a Year'. The post lays out the following train of thought. "An all white web page uses about 74watts to display, while an all black page uses only 59 watts."
Google,which has a white background and gets about "200 million queries a day" could reduce global energy use by 750 Megawatt-hours a year by simply changing the color of its homepage to black.
In response to this factor A black version of Google emerged called BLACKLE. According to Blackle's homepage at publication time, 4,408.917 Watt hours have been saved .
The site encourages users to "make a difference today by ... Blackling "energy saving tips" or visiting TREEHUGGER, a great blog dedicated to environmental awareness." Nice ideas. But how does the search measure up? Very well indeed. Give it a whirl yourself and start saving energy one search at a time.