Green IT :reduce your information system's environmental impact while adding to the bottom line

 Velte, Toby J.; Velte, Anthony T.; Elsenpeter, Robert C.,;

New York : : McGraw-Hill , 2008

Hot, flat, and crowded: why we need a green revolution, and how it can renew America

 Friedman, Thomas L.;

New York : Farrar, Straus And Giroux , 2008