Google's data centres rank among the most energy efficient in the world, with very low PUE factors. A PUE is the Power Usage Effectiveness, and is similar to efficiency. The lower values use less power for the same useful output. By promoting publicly Google's efforts to become more green they can both build a positive brand as an environmentally friendly company and encourage people to look at their own energy consumption.
Here's a quick video from Google about how their servers cope with emails in the most energy efficient way possible.
More info: Google Green
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