The Ohmsett research facility, which researches oil spill response, was closed just before the Exxon Valdez accident. It was reopened as part of the measures included in the Oil Pollution Act of 1990. Jeff Brady/NPR hide caption

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Washington Post advice columnist Judith Martin compares surveys to an insecure friend: " 'Are you sure you like me? Really? Do you like me?' And after a while you want to say, 'No! Go away!' " iStockphoto hide caption

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Gas flaring near Highway 85 southwest of Williston. Analysts estimate that almost 30 percent of the gas being produced in the state is burned off. Jeff Brady/NPR hide caption

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A drilling site rises from the middle of farmland near Fairfield, N.D. Many farmers and ranchers are profiting from the state's oil boom, but others complain that drillers are interfering with their business. Jeff Brady/NPR hide caption

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Propane cylinders sit on the grounds of Blue Rhino, a propane gas company, in Tavares, Fla. In the Midwest, farmers needed more propane for crops that came in later than normal. Gerardo Mora/Getty Images hide caption

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The Deepwater Horizon oil rig burns in the Gulf of Mexico in April 2010. Gerald Herbert/AP hide caption

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The building at 120 East 81st Street is among those converting from an oil- to natural-gas-burning furnace. Jeff Brady/NPR hide caption

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