The annual life cycle burden of a computer is 5,600 MJ. Because only 34% of the desktop's life cycle energy consumption occurs during the use phase, extending the lifetime of a computer could mitigate the energy burden of the production and disposal phases.
Since 2001 the University of Michigan’s Center for Sustainable Systems has developed a growing set of factsheets that cover topics including energy, water, food, waste, buildings, materials, and transportation systems. Each factsheet presents important patterns of use, life cycle impacts and sustainable solutions. They are designed to inform policymakers, business professionals, students and teachers. The factsheets are peer-reviewed and updated annually.