From FP:

Roger Stern, an economic geographer at Princeton University...published a peer-reviewed study on the cost of keeping aircraft carriers in the Persian Gulf from 1976 to 2007. Because carriers patrol the gulf for the explicit mission of securing oil shipments, Stern was on solid ground in attributing that cost to oil. He had found an excellent metric. He combed through the Defense Department's data -- which is not easy to do because the Pentagon does not disaggregate its expenditures by region or mission -- and came up with a total, over three decades, of $7.3 trillion. Yes, trillion.


And that's just a partial accounting of peacetime spending. It's far trickier to figure out the extent to which America's wars are linked to oil and then put a price tag on it.

It's also far trickier to put a price on oil's damage to the environment.
 


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