(Reuters) - As the U.S.-China trade war erodes confidence and central banks prepare to unleash another wave of stimulus, investors are checking which advance warning indicators might be forecasting a global economic recession.A decade after the 2008 financial crisis, one of the most accurate predictors of U.S recessions - inversion of the government bond yield curve - has kicked in. But forecasting global recessions is trickier. Most countries simply can't match U.S. data for breadth. Global..