Qatar's energy minister Mohammed Al-Sada (L), president of OPEC, and Secretary-General of OPEC Mohammed Barkindo attend a press conference after an OPEC ministerial meeting in Vienna, Austria, Nov. 30, 2016. The OPEC on Wednesday decided to cut its oil output by 1.2 million barrels per day, setting the ceiling of oil production at 32.5 million barrels per day (bpd). (Xinhua/Liu Xiang)