Farmhand Doug Maddox uses liquid nitrogen on Greg Sherwood's corn crop in Crawford County, Illinois, expecting a bumper crop for ethanol.
Farmhand Doug Maddox uses liquid nitrogen on Greg Sherwood's corn crop in Crawford County, Illinois, expecting a bumper crop for ethanol. Robert Cohen / St. Louis Post-Dispatch / MCT
Farmhand Doug Maddox uses liquid nitrogen on Greg Sherwood's corn crop in Crawford County, Illinois, expecting a bumper crop for ethanol. Robert Cohen / St. Louis Post-Dispatch / MCT

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Nitrogen emerges as the latest climate-change threat

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