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Shit. That's a given already. It's not just a matter of losing oil and gas as energy sources. Once oil hits $300/barrel are we ready for the majority of our manufactured goods to increase by 50-200%? Look around you and find five things not made of plastic. I sort of fancy a birds eye maple laptop. I'm kind of surprised Sharper Image or Neiman Marcus hasn't introduced this sort of thing already.
I'm more sanguine about the predicted fertilizer shortage - we should be using composted matter for this anyway. But oil has more important uses in our modern oil than being a fuel source.