jfruh writes: "The word "cloud," with its connotations of ethereal wispiness, was perfectly chosen by marketers to obfuscate a key reality of cloud computing: it requires huge data centers that use up massive amounts of electricity. There's something of a competition on to see who can build the most energy efficient data centers, in order to cut costs and build up green PR. But the question of how green a data center is should be answered by not just how much electricity it uses, but also where that electricity comes from. That can be hard to track down, but Greenpeace has done the legwork in a new report."
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