Photographer: Eli Hartman/Bloomberg The US oil and gas industry slashed 40% of its workforce over the past decade of record-breaking production — and those jobs are unlikely to return. In an industry known for its booms and busts, higher oil prices have historically spurred greater drilling activity, and therefore more hiring. But this link broke after years of poor returns to investors following the bursting of the shale bubble in the mid-2010s. Most Read from Bloomberg New technologies to drill fast ...