Formulate an argument that focuses on Potential causes of rising Global oil prices during approximately the past 36 months.

Formulate an argument that focuses on Potential causes of rising Global oil prices during approximately the past 36 months. The first big spikes in oil prices began around mid-2005, and rose steadily until late 2008 when we saw them drop again. The focus of the essay should be on identifying potential reasons for this, and not on the effects of rising oil prices or about solutions to the problem.