NEWSWEEK’s Global Green Ranking List provides an exclusive environmental ranking of the world's 100 largest corporations. For more than a year, the magazine worked with leading environmental researchers KLD Research & Analytics, Trucost, and CorporateRegister.com to rank the 100 largest Global companies based on their actual environmental performance, policies, and reputation. More than half of the companies' overall Green Scores are based on their environmental policies and reputation, industry-neutral metrics that help even the playing field for companies in carbon-intensive businesses. To overcome limited corporate emissions numbers, NEWSWEEK used data from Trucost, which has created a widely acclaimed system for estimating emissions of companies that fail to provide them.
 
Over time, we hope NEWSWEEK's rankings will become more precise as more companies begin to report their numbers and that they will open a conversation on measuring environmental performance—an essential first step toward improving it.