As OPEC+ producers head toward a consensus on extending their output curbs, oil’s rally is prompting some U.S. producers to open their taps once again. With U.S. futures rising as much as 3% on Tuesday, resuming its record advance last month, concern is emerging that the increase will encourage more American shale output. That could undercut efforts by OPEC and allies such as Russia to cut supplies in a bid to shield the market from demand losses in the wake of the coronavirus crisis. Further evidence of that threat emerged this week, when U.S. driller Parsley Energy Inc. said it’s turning oil wells back on just weeks after shutting them off, illustrating the shale […]