Oil plunged by 7%, the most since September, as vaccination efforts in some parts of the world stalled, casting uncertainty over the speed of an economic recovery and a full rebound in global oil demand. West Texas Intermediate crude futures declined for a fifth session, the longest stretch of daily losses in more than a year. China lifting less crude and U.S. Gulf Coast refineries still recovering from a cold blast last month have put short-term pressure on physical oil demand. Meanwhile, some efforts to distribute Covid-19 vaccines have faltered and a stronger dollar is reducing the appeal of commodities priced in the currency. The collapse in prices has wiped out more than two weeks of gains for the U.S. benchmark crude and represents a setback for a market that has otherwise staged a remarkable recovery since the depths […]