Was browsing on Google, found this:
Source."White is Costly and Black is Cheap when it comes to color and electricity. In my earlier post, Switch Off Your Monitor and Save Energy, I mentioned that switching off the monitors when not in use could save lot of energy. Now it seems you can also save energy just by shifting from White Google to black Google. According to EcoIron, “An all white web page uses about 74 watts to display, while an all black page uses only 59 watts.†As Google currently has more than 200 million queries a day, and if Google has a black background, it would save 750 Megawatt-hours a year! Thats lot of energy which means Google with a white background is very costly.
Blackle took this point into consideration and they have created an all black homepage for searching in Google. Have a look at this and try it out. Black Google seems to be little odd as we are quite acquainted with the White Google.
So, Will you switch to black Google on the basis of energy conservation? Let me know your opinion!"
Click for site.I Already switched.