Oil jumped after the OPEC+ alliance left the door open to reversing its decision to boost output at any moment, with the impact of the omicron variant on demand remaining highly uncertain. West Texas Intermediate climbed above $68 a barrel after closing higher on Thursday following the producer group’s decision. OPEC+ agreed to add 400,000 barrels a day of crude to global markets in January, but it essentially put a floor under prices by giving itself the option to change the plan on short notice.