Lenovo ThinkCentre M58 / M58p
Like their green brethren, ThinkCentre desktops are Energy Star 4.0 compliant and have earned the EPEAT gold rating.
What makes the ThinkCentre especially green? Systems using their power-management tools can reduce energy consumption by 69 percent [source: Lenovo]. Lenovo estimates that energy savings translate into a cost savings of $40 on your yearly electricity bill. And it's not just dollars saved, it's CO2 emissions reduced, too. The ThinkCentre is designed to reduce CO2 emissions by 575 pounds (261 kilograms) per desktop every year, which is about the same as if 185 gallons (703 liters) of gasoline went unused [source: Lenovo].