Peak oil
Since the industrial revolution, oil has been the driver of global increases in GDP. When it runs out, maybe as soon as in 20 years, or becomes too expensive, we will lose all the GDP growth and perhaps revert to a largely agrarian existence without high petroleum based crop yeilds (if we survive the commodity wars) until a suitable replacement for oil is found. What do you think society be like after the oil age has finished?
Bingo.
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