Newsweek published a comprehensive survey this week that rates the environmental accountability of America’s 500 largest publicly traded companies. Hewlett-Packard took top honors for its commitment to reducing greenhouse gas emissions. Dell, Johnson & Johnson, Intel, and IBM round out the top five. The rankings are based on a variety of criteria, including the company’s environmental impact, green policies, and reputation. Newsweek worked with KLD Research and Analytics, Trucost, and CorporateRegister.com to compile their data and develop a ratings system that could apply to a range of different industries. So who fared the worst? That would be Peabody Energy, a private-sector coal company.