Lenovo Thinkpad X61 Energy Star

“All the Thinkpad X Series Notebooks are Energy Star 4.0 Qualified”. What this means? I just read short reviews Lenovo Thinkpad X61 series when found this statement. ENERGY STAR is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices. Lesson to learn is that when ever you buy electronic product please make sure that the product have ENERGY STAR label.