The world's coolest data centers

Data centers gobble up energy and generate heat, but here are some data centers that try to do it with their own flair

Citi Data Center, Frankfurt, Germany: The facility uses fresh air for cooling, reverse osmosis to reduce sediment build-up in cooling towers and thereby saving 13 million gallons of water per year and uses virtualization to reduce the number of physical servers needed. But the building also has a green roof made up of living plants that help reduce runoff from the building and to keep it cool. The green wall shown here is made up of living plants that don't improve the efficiency of the center, but promote biodiversity at the site.

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