codewars.com (learn_2_code)

Race #596

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Official speed 67.49 wpm (70.59 seconds elapsed during race)
Race Start January 22, 2015 7:48:40am UTC
Race Finish January 22, 2015 7:49:50am UTC
Outcome No win (2 of 5)
Opponents 1. edzil1007 (76.95 wpm)
Accuracy 95.0%
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.