If China allows the yuan to strengthen more then that will be the biggest pressure... i.e. higher domestic costs = less demand for commodities. It's the China syndrome that drove commodity prices higher in the first place and it will ultimately be the China syndrome that bursts the bubble. Interest rates, the oil price, political tensions etc.... These are all nice little puffs of air under the main thrust of Chinese growth... They won't be able to hold the brick when it eventually falls...