Vera Cole is president of the Mid-Atlantic Renewable Energy Association, a group arguing against proposed rules in Pennsylvania that would put stricter limits on how much grid-connected solar power homeowners can produce on their property. Jeff Brady /NPR hide caption

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Pump jacks are seen in an oil field over the Monterey Shale formation near Lost Hills, Calif. Much of the U.S. oil industry wants to lift an export ban that followed the 1970s energy crisis. David McNew/Getty Images hide caption

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Patrick Roy's company, Coastal Rental Equipment, used to rent these large pumps to offshore divers who work for oil and natural gas drillers. After the BP oil spill, when the government introduced a moratorium on drilling in the Gulf of Mexico, the Patterson, La., business suffered losses and eventually shut down. Jeff Brady/NPR hide caption

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The headquarters for University of Pittsburgh Medical Center and Highmark Blue Cross/Blue Shield dominate the Pittsburgh skyline much as they organizations have dominated health care in the region for decades. Jeff Brady/NPR hide caption

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Some 5,000 union members, led by the United Mine Workers of America, march outside the William S. Moorhead Federal Building on Thursday in Pittsburgh. The city hosted two days of public hearings by the Environmental Protection Agency on stricter pollution rules for coal-burning power plants. Gene J. Puskar/AP hide caption

itoggle caption Gene J. Puskar/AP