The global economy is once again showing some worrying signs of a slowdown, opening up a major downside risk to oil prices. Global trade volumes are declining for the first time since the end of the 2008-2009 financial crisis, according to Reuters. Between December and February trade volumes contracted by 0.8 percent compared to the same period a year earlier. John Kemp of Reuters says the global economy is “one more shock away from recession,” pointing to a series of worrying indicators, including a contraction in cargoes at Hong Kong’s…