Daniel Yergin

Yergin: "Things don’t stand still in the energy industry. With the passage of time, unconventional sources of oil, in all their variety, become a familiar part of the world’s petroleum supply. They help to explain why the plateau continues to recede into the horizon—and why, on a global view, Hubbert’s Peak is still not in sight."

Brown: "Contrary to Mr. Yergin’s assertion that advocates of Peak Oil have been wrong at every turn, six years of annual global production data show flat to declining crude oil and total petroleum liquids production data. … I suspect that just as Mr. Yergin was perfectly wrong about oil prices, he may be confidently calling for decades of rising production, just as we come off the current production plateau and just as an accelerating decline in Global Net Exports kicks in."