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The range of products and services sold on Amazon.com are expanding quickly as part of CEO Jeff Bezos' vision for the Internet retailer. Karen Bleier/AFP/Getty Images hide caption

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Karen Bleier/AFP/Getty Images

Mike Barlow has been installing geothermal systems for 20 years. But he says a 30 percent federal tax credit is increasing the popularity of the systems for families with modest houses. Elizabeth Shogren/NPR hide caption

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Elizabeth Shogren/NPR