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Green computing or sustainability is not simply the operational energy consumption of computing equipment. Green computing must take the product life cycle into consideration, from production to operation to recycling. This study focuses on the production and the operation phases of the product life cycle and demonstrates what actions will result in overall carbon footprint reduction for personal and business computing under various operational conditions and environments. Energy consumption related to end-of-life product recycling is not discussed in this study and is not believed to have a significant impact on the validity of the sustainability analysis based on production and operation energy consumption and carbon footprint.