This short guide presents the major environmental concerns posed by computers -- such as products that are designed for disposal and the use of toxic materials in computer manufacturing -- and lists what to look for when purchasing a computer, including lease and take-back options and readily upgradable hardware. Most helpful for companies wishing to put this guide's ideas into practice is the "Manufacturer's Environmental and Products Information" section, which lists the environmental pages of IBM, Dell, and Compaq, and the "Third Party Certifiers" section, which lists resources from certifying and rating organizations, including the U.S. EPA’s Energy Star.