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Underlying data are drawn from a variety of sources, including the companies themselves, and vetted for reliability. The hundreds of companies tracked by Newsweek are collectively responsible for more than 6 billion tons of greenhouse-gas emissions each year, nearly equivalent to all the emissions produced annually by the United States. And that number would be exponentially larger if it included the emissions that result from use of the products many of them sell.

The Newsweek rankings suggest that the U.S. is trailing other parts of the world in the sustainability arena. After IBM (No. 2 on the global list), there are 12 spots before the next American company (HP, No. 15 globally). A number of European companies are in between, as well as firms from Australia, Brazil, India, Canada, Japan, and Mexico (Walmart’s Mexican arm, at No. 14). Due largely to Europe’s tighter regulatory environment, European companies dominate when it comes to transparent disclosure. 

Here is a snapshot of the Top 15 Greenest Companies Globally: