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I know that have been some efforts to make server cooling more “green” in the US. One example that I have personally seen is a local university locating some servers in the desert area of a local public conservatory, with the goal not only being decreased cost to cool the servers, but also decreased heating cost for the conservatory. In contrast to using chillers, which are the mechanical cooling devices in place at most large data centers that use a lot of energy; open air cooling can be significantly cheaper. The downside is that it is much more difficult to control temperature fluctuations. I would guess that one advantage of using the conservatory is that there are years of records showing temperature within the environment, so the min/max temperature is pretty predictable at this point. Dell has recently started to warranty many of its servers to operate at 104 degrees for up to 900 hours a year and at 113 for 90 hours a year, so the expanded temperature range for server operations should help make it easier for big data centers to become greener in the future without the same level of concern as there is today that relatively small temperature increases will have significant impact on server longevity and performance