Saudi King Abdullah bin Abdul Aziz al-Saud (R) greets Algerian President Abdel Aziz Bouteflika (L), with Saudi Defence Minister Prince Sultan bin Abdul Aziz al-Saud in the background, upon his arrival for a two-day OPEC summit in Riyadh, 17 November 2007. OPEC heads of state met in Riyadh today for a rare summit, with the organisation divided over the falling US dollar and attempts to give a political impetus to the oil-exporting cartel. Venezuela's President Hugo Chavez took the podium for the opening as he joined fellow leaders from OPEC oil-exporting countries for only the third gathering of heads of state in the organisation's 47-year history. AFP PHOTO/HASSAN AMMAR (Photo by HASSAN AMMAR / AFP)        (Photo credit should read HASSAN AMMAR/AFP/Getty Images)