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I blogged on Chandrakant's work measuring lifetime energy use last December. He runs the Sustainable IT Lab at HP. In this podcast, he expands on the issues he's researching on least use of energy, the 2nd Law of Thermodynamics and using Joule's as a measurement of energy consumption. In our discussion, Chandrakant refers to the following sketch he created to show 'cradle-to-cradle' energy use.