Nigeria's Petroleum Minister and OPEC's alternate president Diezani Alison-Madueke adjusts her glasses at the annual IHS CERAWeek conference in Houston, Texas March 4, 2014. REUTERS/Rick Wilking ... more 
Nigeria's Petroleum Minister and OPEC's alternate president Diezani Alison-Madueke adjusts her glasses at the annual IHS CERAWeek conference in Houston, Texas March 4, 2014. REUTERS/Rick Wilking (UNITED STATES - Tags: BUSINESS ENERGY POLITICS) less 
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Reuters | Photo By RICK WILKING / REUTERS
Tue, Mar 4, 2014 12:20 PM EST