"An all white web page uses about 74 watts 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 post a black version of Google emerged called Blackle.com

Give it a whirl yourself and start saving energy one search at a time. :: Blackle.com ( http://www.blackle.com/ )

Blackle saves energy because the screen is predominantly black.. How ? ( http://www.blackle.com/about/ ). Try Blackling "energy saving tips" or visit http://www.treehugger.com/ a great blog dedicated to environmental awareness.