An OPEC sign hangs outside the OPEC Secretariat ahead of the 171st Organization of Petroleum Exporting Countries (OPEC) meeting in Vienna, Austria, on Tuesday, Nov. 29, 2016. An OPEC deal to curtail oil production appeared in jeopardy as Iran said it won??????t make cuts while Saudi Arabia insisted Tehran must be willing to play a meaningful role in any agreement. Photographer: Akos Stiller/Bloomberg Photo: AKOS STILLER
