i_like_spam (874080) writes "Commentary at Nature Climate Change describes an on-going debate about the energy savings associated with the background colors used by high-traffic websites such as Google and the NYTimes. Some back of the envelope calculations have suggested energy savings of 750 Megawatt hours per year if Google switched their background from white to black. Google responded by creating Blackle. Other calculations by the Wall Street Journal, however, suggest minimal energy savings. Who is right in this debate? And, should designers also consider potential energy savings when choosing colors for their websites?"