Oil and Gas: 'Twilight in the Desert' author Simmons talks about Saudi oil supply and international economy.

Are the Saudis running out of oil, and are their reserve estimates accurate? What other sources might help fill the gap if Saudi production declines? And what will be the effects on the U.S. and world economies from steep drops in Middle East oil production?

On today's OnPoint interview ... E&E Daily's Brian Stempeck talks with Matthew Simmons, veteran oil analyst and author of a new book, "Twilight In The Desert: The Coming Saudi Oil Shock and World Economy," about the future of world oil supplies and what it means for the international economy

Transcript.