The only OPEC members that haven’t pledged to attend talks in Doha next month aimed at freezing oil production levels are Iran and Libya: the two nations with the greatest capacity to restore halted output. The other 11 members of the Organization of Petroleum Exporting Countries have agreed to meet in the Qatari capital on April 17, officials from the respective countries have said. The absence of Iran and Libya, which are determined to restore supplies shuttered by conflict and sanctions, means any accord […]