FILE - In this March 30, 2011 file photo, Sen. Sherrod Brown, D-Ohio testifies on Capitol Hill in Washington. Friends of coal are certain they know the enemy. They point to President Barack Obama and his Environmental Protection Agency, arguing that the administration's new clean air rules dealt a devastating blow to a multibillion-dollar industry that has been the lifeblood of Appalachia for generations. The standards imposed earlier this year tightened limits on existing coal powered-plant emissions; agency guidelines on restricting greenhouse gases could affect new plants as early as 2013.   (AP Photo/Harry Hamburg, File)
{}