Updated Oct. 2015: The update makes the connection between falling oil prices 2014-2015 and OPEC's strategy to make hydraulic fracture drilling ("fracking") unprofitable for US oil companies.
This 27-slide PowerPoint presentation introduces the history and purposes of OPEC. It includes large visuals, political cartoons, and student-friendly charts and graphs. Dependence on OPEC oil sources is shown with interesting facts and photos from the 1973 Energy Embargo. This PowerPoint also connects rising gas prices to increased global consumption.
The PowerPoint comes with two pages of guided notes in case you want those. (These are included in Word format - editable - as well as PDF format.) The PowerPoint itself has underlines which correspond to the guided notes, but you are also free to edit out the underlines.