Peak oil is a perennial topic on TreeHugger, with huge implications for energy and climate policy even though it is only now (too little, too late) being taken seriously or even really talked about outside of energy wonk circles. To get you up to speed on the topic and explore the future consequences of ever decreasing oil supplies, The Nation has begun a weekly video series, now through March, on the subject. If you don't already have a grasp of what peak oil is about, I highly recommend you get up to speed quickly--this series, including commentary and analysis from Richard Heinberg, Bill McKibben, James Howard Kunstler, Noam Chomsky, and others, is a great place to start.
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More on Peak Oil:
Peak Oil Alarm Raised By Secret Government Talks
Jeff Rubin: Peak Oil Will Make Our World A Whole Lot Smaller
If Peak Oil is Now or in 2030, We're Still Woefully Unprepared