Iran's Minister of Petroleum Rostam Ghasemi talks to journalists as he arrives at a hotel for the Organization of the Petroleum Exporting Countries, OPEC, conference in Vienna, Austria, Thursday, May 30, 2012. Once the symbol of oil dominance, OPEC faces new challenges as its members gather for a ministerial meeting on how much crude to pump. For the 12 oil ministers from countries ranging from Venezuela to Nigeria and Iran, the formal focus of Friday's get-together is to determine production levels. (AP Photo/Hans Punz)

Associated Press
Iran's Minister of Petroleum Rostam Ghasemi talks to journalists as he arrives at a hotel for the Organization of the Petroleum Exporting Countries, OPEC, conference in Vienna, Austria, Thursday, May 30, 2012. Once the symbol of oil dominance, OPEC faces new challenges as its members gather for a ministerial meeting on how much crude to pump. For the 12 oil ministers from countries ranging from Venezuela to Nigeria and Iran, the formal focus of Friday's get-together is to determine production levels. (AP Photo/Hans Punz)
Iran's Minister of Petroleum Rostam Ghasemi talks to journalists as he arrives at a hotel for the Organization of the Petroleum Exporting Countries, OPEC, conference in Vienna, Austria, Thursday, May 30, 2012. Once the symbol of oil dominance, OPEC faces new challenges as its members gather for a ministerial meeting on how much crude to pump. For the 12 oil ministers from countries ranging from Venezuela to Nigeria and Iran, the formal focus of Friday's get-together is to determine production levels. (AP Photo/Hans Punz)
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