Have you ever wondered what cities used to be the nation’s centers for refining petroleum? On this week’s Energy Bite, Joel Tarr, a professor at Carnegie Mellon University, has some answers.

Have you ever wondered what cities used to be the nation’s centers for refining petroleum? On this week’s Energy Bite, Joel Tarr, a professor at Carnegie Mellon University, has some answers.

Have you ever wondered what cities used to be the nation’s centers for refining petroleum? On this week’s Energy Bite, Joel Tarr, a professor at Carnegie Mellon University, has some answers.

Have you ever wondered what cities used to be the nation’s centers for refining petroleum? On this week’s Energy Bite, Joel Tarr, a professor at Carnegie Mellon University, has some answers.