Businessman Tom Wolf talks to U.S. Rep. Allyson Schwartz before the Pennsylvania Democratic Gubernatorial Primary Debate last week in Philadelphia. Michael Perez/AP hide caption

itoggle caption Michael Perez/AP

A Philadelphia Gas Works employee replaces old steel and cast-iron pipes with new plastic pipes that are less likely to leak. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

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

itoggle caption Jeff Brady/NPR

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

itoggle caption iStockphoto

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

itoggle caption Jeff Brady/NPR

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

itoggle caption Jeff Brady/NPR

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

itoggle caption Gerald Herbert/AP

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

itoggle caption Jeff Brady/NPR

Lela Petersen, owner of the Anything And Everything store in Flagler, Colo., expects the cost of health insurance for her and her husband to drop by my more than half next year. Jeff Brady hide caption

itoggle caption Jeff Brady