Can changing Google's background color save energy?

Yes, this site is Google's response to a scientific article, address is: http://blogs.nature.com/climatefeedback/2007/07/google_turns_to_the_dark_side.html

The content is roughly:

An article in Nature Climate Change documents the debate among some: Changing the white background of web pages saves energy - this comes from a blog post by Mark Ontkush in January, who reckons that a screen showing white, such as a blank word page or Google home page, uses 74 watts of electricity, compared with 59 watts if the background color is black. He also calculated that heavily trafficked websites like Google and The New York Times could save 750 Megawatt hours a year by switching to a black background. Google quickly responded by creating a black background search site called Blackle. But in the recent Wall Street Journal also carried out a calculation, the conclusion is that the energy-saving effect is not obvious. "