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In the beginning, there was Power Usage Effectiveness (PUE). Now, the range of metrics is expanding. The Green Grid has adopted Carbon Usage Effectiveness (CUE) and Water Usage Effectiveness (WUE). These two new metrics, modeled after PUE, are reviewed in the context of how to improve your data center operations. A brief background review of metric development and definition will be followed by detailed discussions of how CUE and WUE can be used in all aspects of the data center lifecycle. The benefits and advantages to beginning their use now is discussed, particularly in light of the growing awareness of the need for sustainable data center operations.