Due in part to raising energy prices and growing concern over the future of the environment, some of America's largest corporations are supporting the push towards green — starting with energy. According to CNNMondy.com reports, the Environmental Protection Agency challenged Fortune 500 companies to double their green power purchases by the end of 2007. The switch would provide enough electricity to run more than 400,000 homes in the U.S. a year.

Reports indicate that there are at least 40 companies who have taken part in the campaign. Among them are Wells Fargo, Whole Foods, Johnson & Johnson, Cisco Systems and Hewlett-Packard. Missing from the list are the number 1 and 2 companies — Exxon Mobil and Wal-Mart.

Experts predict that the switch to sustainable energy is just the first step in "going green."

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