Three Greenpeace activists wearing bio-hazard suits, hold old laptops and wear face masks depicting Hewlett-Packard (HP) Chief Executive Officer Mark Hurd during a protest outside the computer company's China headquarters in Beijing June 25, 2009. REUTERS/David Gray

Newsweek, encroaching on territory usually mined by activist groups like Greenpeace and the Sierra Club, has unveiled its innaugural NEWSWEEK Green Rankings, which ranks the 500 biggest U.S. companies based on their “actual environmental performance, policies, and reputation.”