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

Nitrogen emerges as the latest climate-change threat

September 12, 2008 01:05 PM

UPDATED September 12, 2008 01:21 PM

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