A petrol station in central Tehran. Iran, the second-biggest producer in OPEC after Saudi Arabia, was producing about 3.3 million barrels a day in May. Full implementation of sanctions will remove about 1 million barrels a day during the second half of the year as buyers disappear and Iranian storage tanks become full, the Paris-based IEA forecast in a June 13 report. Photographer: Behrouz Mehri/AFP/Getty Images