How green energy saves the Fortune 500 billions

For Fortune 500 companies, green energy and greentech programs must not just be good for the environment, but solidly in the black. Here's how some businesses have managed to grow their bottom lines while also reducing their carbon footprints.

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Top Tweeters: Social media champs This group of companies is all about Tweeting, Facebook Liking and Linking In -- among other social media tools -- in order to better connect with and serve their customers. More