The future of the world's oil, and why finding another fuel source is critical

The future course of the global economy remains highly uncertain. And the "fuel" that runs that economy – oil – has seen prices fluctuate dramatically within the past year. The price of oil has dropped from over $30 a barrel over the last five months – even as the Arab Spring continues to destabilize the oil-rich Middle East.

On American Morning this morning, Christine Romans talks with Daniel Yergin, author of "The Quest: Energy, Security, and the Remaking of the Modern World," to get his take on why oil prices have been so volatile – and why the United States urgently needs to diversify its energy supply.