Market comment: Why cleantech stocks have the energy advantage

7 Aug 2009

By Sam Hopkins - The S&P 500 just broke the 1,000 mark for the first time since November. With a price-to-earnings ratio of 65, the broadest U.S. benchmark is now about 225% over last year's premium of 20.

That's too top-heavy for many skittish investors out there, especially since we've been inching higher and higher on low trading volume.

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