Ali al-Naimi, Saudi Arabia's petroleum minister, left, speaks as Abdalla El-Badri, OPEC secretary-general, sits and listens during the 6th OPEC International Seminar 'Petroleum: An engine for Global Development' in Vienna, Austria, on Wednesday, June 3, 2015. Brent's recovery from a six-year low in January is stalling on signs a global glut will persist as OPEC members pumped above their target for a 12th consecutive month. Photographer: Lisi Niesner/Bloomberg via Getty Images