Google is disappointed with the lack of breakthrough investment ideas in the green technology sector but the company is working to develop its own new mirror technology that could reduce the cost of building solar thermal plants by a quarter or more. "We've been looking at very unusual materials for the mirrors both for the reflective surface as well as the substrate that the mirror is mounted on," the company's green energy czar Bill Weihl told Reuters Global Climate and Alternative Energy Summit in San Francisco on Wednesday.
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