Daniel Yergin

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It is 150 years since a Colonel Edwin Drake drilled 69 feet into hard rock in a distant part of Pennsylvania and a thick black liquid oozed out, ushering in the Age of Oil. And in this edition of Global Business Peter Day talks to one of the world's great experts on oil and the energy industry - Daniel Yergin of IHS CERA, author of 'The Prize: The Epic Quest for Oil, Money and Power'.