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Greenpeace has slated April 21, 2011 as the kickoff of their Green:Net series with a special focus on their “Facebook: Unfriend Coal” campaign. Even if Facebook doesn’t cave before then, the eco-minded group will be holding discussions on how other companies like Apple are using green energy to juice up their cloud computer systems.

As energy prices rise it may be a very smart move for Facebook to invest in green energy. For instance, Google spends about $38 million a year just to power their data centers. To offset some of that cost they’ve invested in a wind farm project in Iowa which may give them dirt cheap energy rates in the future. In the UK, HP decided to build a data center that was cooled by the cold winds of the North Sea instead of a using pollutant spewing air conditioners; the technology will save them $5.6 million a year in energy costs for a 43,055 sq. ft. facility.