Global oil markets have hit the bottom of the barrel, according to a host of the world’s most senior oil traders. The chief executives of some of the world’s biggest energy merchants said Tuesday that the end is in sight for a near two-year slump in crude prices that has hammered energy companies’ earnings and sent shock waves through the global financial system. “We’re going to have a lot of volatility going forward, but from here on, the trend is up,” Swiss trading house Gunvor Group’s CEO Torbjorn Tornqvist told the FT Commodities Global Summit in Lausanne, predicting a slow recovery to around $60 to $70 a barrel. Mr. Tornqvist’s view was echoed broadly by a number of his peers, though opinions on exactly when and how fast prices might recover were more varied. […]