 Consumers are powering China’s petroleum use. As China’s slowdown becomes clearer, the ground is shaking beneath commodities bulls’ feet. Yet there is one corner of the commodities markets that can relax somewhat easier—oil. Investors in iron ore and copper are on edge after and inflation data , not to mention the default of a local bond. in January and February was weaker than expected, while fixed-asset investments rose at their slowest since 2002. That is bad news for metals. China’s consumes two-thirds of the world’s seaborne iron ore and 40% of its copper. And prices have reacted. Copper slid 8% the past week in London trading to its lowest level since mid-2010. Oil is a different story. While China accounts for 10% of global petroleum consumption and 40% […]