Just off Interstate Highway 25, Drill Rig 1548 of Encana Natural Gas stands near homes in the town of Frederick in Weld County, Colorado. milehightraveler/iStockPhoto hide caption

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An oil refinery is pictured in the southern Sydney suburb of Kurnell earlier this week. Australia's Senate voted on Thursday to scrap the country's carbon tax and plans for emissions trading — a major victory for conservative Prime Minister Tony Abbott. Jason Reed/Reuters/Landov hide caption

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Mark Bortman of Exact Solar in Yardley, Pa., says having leased solar panels on a roof can add an extra step when selling a house. He says typically a buyer will assume the remainder of the lease, but that requires a credit check and some paperwork Jeff Brady/NPR hide caption

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Scotland's offshore oil platforms in the North Sea generate significant wealth for the nation — especially for the Shetland Islands, where oil tanker traffic boosts the local economy. Andy Buchanan - WPA Pool/Getty Images hide caption

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The Department of the Interior is proposing a large expansion of U.S. efforts to make energy from offshore winds, with a plan centered off the Massachusetts coast. Here, a 2010 photo shows a sunrise over Nantucket Sound. Julia Cumes/AP hide caption

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