Davis Turner/Getty ImagesOil markets could experience more intense price volatility in the coming years because of insufficient investment in new production, according to the head of the International Energy Agency’s oil market and industry unit, Neil Atkinson. Speaking at a conference in Manama, Bahrain, Atkinson noted that investment is returning to the oil industry too slowly to eliminate the risk of tighter supply that would, in turn, cause price volatility even in the context of slowing global oil demand growth.