Daniel Yergin

"The Russians are turning east to the Chinese - to the Europeans' surprise. It always seemed to me that the relationship between Russia and China would shift from being based in Marx and Lenin to being based in oil and gas."

"So the major obstacle to the development of new supplies is not geology but what happens above ground: international affairs, politics, investment and technology."

"People always underestimate the impact of technology. To give you an example: In the 1970s the frontier for offshore development was 200 meters, today it is 4,000 meters."