For the last two decades a growing share of the nation’s corn crop has gone towards producing ethanol, to be used as an additive in gasoline. Today, somewhere between 35 to 40 percent of all corn grown is used to produce ethanol. The ostensible motivation for the legislation creating the mandate two decades ago was to help the U.S. become energy independent, while Democrats supported it because of its perceived environmental benefits via reduced greenhouse gas emissions.
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