Oil companies are reviving investment after a two-year rout as OPEC output cuts boost prices, easing but not eliminating the risk of a future supply crunch, the International Energy Agency said. There are “signs of a modest recovery” in spending in 2017 following two years of big investment cuts, the Paris-based agency said Monday in a report. The IEA doubled forecasts for production growth outside OPEC next year as U.S. shale producers emerge “leaner and fitter” from the downturn. The Organization of Petroleum Exporting Countries and Russia headed an agreement among 24 oil producers last year to clear a global glut, spurring a 20 percent rally in crude prices. Before that decision, OPEC had refused to reduce output on the grounds that any curbs would bail out rival producers. “Until the agreement was struck, prices threatened to return to the levels seen in early 2016” of less than $30 […]