6/10/2014
Solar tower at Ivanpah, Calif.
Steve Marcus/Reuters

Major investment firms including Warren Buffett's Berkshire Hathaway are placing big bets on solar energy, and industry officials say solar is already making serious money and putting a big dent in the country's carbon footprint. "From an environmental perspective, this is just a really great story," says Tom Doyle, president of NRG Solar.

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