Harold Hamm, the billionaire shale oilman, said the U.S. industry could “kill” the oil market if it embarks into another spending binge, a rare warning in a business focused on fast growth to compete with OPEC. The statement, at an energy conference in Houston on Wednesday, comes as top shale companies announce large increases in spending for this year, and the U.S. government says domestic oil output next year will surpass the record high set in 1970. OPEC ministers have said they are keeping a close watch on shale production to decide in late May whether to extend their oil-supply cuts into the second half of the year. Oil prices plunged 5 percent on Wednesday to their lowest level this year, falling just above $50 a barrel, on investor concerns about unbridled growth in America’s shale basins swelling U.S. inventories. U.S. production “could […]