The Newsweek Green Rankings 2010 are out, and Dell improved from its number two spot on the Green Rankings 2009 list to earn the top spot this year. The Newsweek Green Rankings assess the 500 largest publicly traded U.S. companies. Each company is given a Green Score, which is comprised of three sub scores: the Environmental Impact Score (EIS), the Green Policies Score (GPS) and the Reputation Survey Score (RSS).

Trucost generated the EIS score after reviewing more than 750 metrics; the EIS score accounts for 45 percent of the overall score. The GPS, which also makes up 45 percent of the overall score, was based on data collected by MSCI ESG Research. The data included a comprehensive assessment of each company’s environmental policies and initiatives. The RSS score is weighted at 10 percent of the overall score and was based on a survey of environmental officers, CEOs and academics.

Dell’s number one spot on the Newsweek Green Rankings 2010 list earned it a perfect 100.00 Green Score. The company’s sub scores include an 81.49 Environmental Impact Score, a 100.0 Green Policies Score and an 84.33 Reputation Survey Score.

“Dell’s focus on environmental stewardship and sustainability helps us to be a more responsible partner to our customers,” said Michael Dell, chairman and CEO. “The efficiencies we can all achieve through the use of greener products, solutions, services and programs should be an integral part of every corporate culture. This ranking is the result of a long-standing commitment that remains at the heart of Dell and the work we do in service of our customers.”

Technology companies dominate the top of the list with eight out of the top 10 spots being awarded to companies in the technology sector. Johnson & Johnson, which recently topped the 2010 Corporate Social Responsibility Index, was the highest-ranking non-technology company, coming in at number four on the list. Johnson & Johnson’s overall Green Score was 99.02 with a 74.95 EIS, a 98.86 GPS and an 80.34 RSS.

Other companies that earned the highest scores in their industry sectors include Ecolab in Basic Materials; Coca-Cola Enterprises in Food & Beverage' Starbucks Corporation in Media, Travel & Leisure; and Office Depot in Retail.

At the other end of the list are the lowest-ranked American companies including Tyson Foods at 481, Monsanto at 497 and Peabody Energy in the last spot. Peabody Energy’s EIS was 1.00, the GPS was 28.46 and the RSS was 54.46, earning the company an overall Green Score of 1.00.

Global companies included for first time

Newsweek changed things with this year’s Green Rankings by adding The Global 100, which ranks the 100 largest publicly traded companies in both developed and emerging markets.

“As companies around the world become more transparent in their efforts to improve their environmental performance, it only made sense to expand our analysis to a global list,” said Newsweek's Global Business Editor Kathy Deveny. “We had great success last year with our listing of U.S. companies and have refined our methodology over the last year in order to create as thorough and accurate a ranking as possible.”

IBM earned the number three spot on the U.S. 500 list and the top spot on The Global 100. Hewlett-Packard comes in just behind IBM with the number two spot on the international list, which compliments the company’s number two ranking on the U.S. list. Johnson & Johnson ranked as the highest-rated non-tech company on the global list as well, this time earning the number three spot.

Unlike the U.S. list, technology companies didn’t dominate the international list. Non-tech companies that ranked in the top 20 include GlaxoSmithKline in fifth, Novartis in sixth, Barclays at number 12, Toyota at number 17 and Pfizer in 20th.

On the opposite end of the international list we find those that ranked near the bottom of The Global 100, including Nestlé’s 22.95 Green Score, which places the company in the number 97 spot. Rio Tinto, a U.K.-based basic materials company, sits at the bottom of the global list with an overall 1.00 Green Score.

Learn more about the Green Rankings 2010 by reading the methodology used to determine the scores and view The U.S. 500 and The Global 100 lists.

As determined by the study, the top 10 greenest companies in America are:

1. Dell Inc.

2. Hewlett-Packard Company

3. IBM

4. Johnson & Johnson

5. Intel Corporation

6. Sprint Nextel Corporation

7. Adobe Systems Incorporated

8. Applied Materials, Inc.

9. Yahoo! Inc.

10. NIKE, Inc.

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