As a concept applied to IT, "green" is one of those terms in danger of becoming whatever the marketing departments at hardware and software makers want it to be. A reasonable person would assume green means "Earth-friendly," implying ecological responsibility. From the IT manufacturer's perspective, going green also provides an inducement for companies to buy new hardware, although that doesn't seem like a very Earth-friendly outcome at all. Sustainability, on the other hand, is something we can measure and manage. We are sustainable when our use of resources does not permanently deplete or damage our supply, including natural resources, energy, and capital. Though perhaps we shouldn't blame the OEMs for using the Green movement to fertilize their bottom lines,