codewars.com (learn_2_code)

Race #534

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Official speed 74.71 wpm (63.77 seconds elapsed during race)
Race Start October 23, 2014 6:08:35pm UTC
Race Finish October 23, 2014 6:09:39pm UTC
Outcome Win (1 of 3)
Opponents 2. lemonytwist (51.75 wpm)
3. danonymous (40.69 wpm)
Accuracy 97.0%
Points 0.00
Text #630 (Length: 397 characters)

It takes more than a calorie of fossil fuel energy to produce a calorie of food. From the standpoint of industrial efficiency, it's too bad we can't simply drink the petroleum directly, because there's a lot less energy in a bushel of corn (measured in calories) than there is in the half gallon or so of oil required to produce it. Ecologically this is a fabulously expensive way to produce food.