[ This is not a genuine article by me, just to let u know abt Blackle.com]
Blackle.com is nothing but a black version of google .A few months ago, TreeHugger Mark Ontkush wrote a post on his blog EcoIron titled Black Google Would Save 750 Megawatt-hours a Year[ http://ecoiron.blogspot.com/2007/01/black-google-would-save-3000-megawatts.html]. The post lays out the following train of thought:"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. According to Blackle's homepage at publication time, 4,408.917 Watt hours have been saved by. The site encourages users to "make a difference today [by] … Blackling "energy saving tips" or visiting treehugger.com,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. :: Blackle.com
So lets make Blackle.com our homepage and default search engine, the difference it makes is a mere 750 Megawatt-hours a Year...!!!!!!
And the Counter pont is:
This is true only for CRT monitors (which are obsolete now).
Only CRT displays use more energy to display brighter things. On an LCD monitor, a black pixel uses more energy than a white pixel.
For an LCD monitor, the backlight on an LCD is on for the entire LCD, regardless of which color is being shown. An LCD monitor uses subtractive color — a white pixel lets the backlight pass through, and a black pixel is using red green and blue to filter and blockout the backlight. To display a black pixel, the LCD blocks out light. When an LCD monitor shows pure black, that’s actually the point at which the monitor is working the hardest, blocking out lights for all the pixels (thus using more voltage). Changing from black to white may save some energy on CRT displays, it might actually cause LCD displays to use slightly more energy.
That means, if you’re going to use one of these “Black Google” sites using an LCD monitor, you’re actually wasting more energy. Not to mention, that it will cause unnecessary stress to your eyes, possibly leading to computer vision syndrome......