HP is billing this business desktop PC as having an environmentally conscious design. It uses a low-power chip set and post-consumer recycled plastic and packaging, and it comes with the 80-percent efficient power supply outlined in the new Energy Star 4.0 requirements. It has earned the stringent Gold rating of the Electronic Product Environmental Assessment Tool (EPEAT), which means that it meets all the required criteria and 75 percent of the optional criteria outlined in the IEEE 1680 standard on environmental performance. (See EPEAT's Web site for the approved configuration.) Plus, according to HP, this desktop can be powered by its $1325 Solar PowerPAC II. For more information on pricing, see this product's latest prices page.