The world's largest companies aren't waiting for governments to act aggressively on climate change, according to a report by Calvert Investments, Ceres and the World Wildlife Fund (WWF).

"Power Forward: Why the World's Largest Companies are Investing in Renewable Energy," shows that a majority of Fortune 100 companies have set renewable energy targets, greenhouse gas (GHG) emissions reduction targets or both. The trend is even stronger internationally, as more than two-thirds of Fortune's Global 100 have commitments.

Through interviews with executives and analysis of public disclosures, the report concludes that clean energy practices are becoming standard practice for most of the largest, most profitable companies in the world, including AT&T, DuPont, General Motors, HP, Sprint, and Walmart.

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