Nedrow notes that between 1987 and 2007:
- The amount of land needed to produce 1 bushel of corn has decreased 37 percent.
- Soil loss above a tolerable level per bushel of corn has decreased 69 percent.
- Irrigation use per bushel has decreased 27 percent.
- The energy used to produce a bushel or unit of corn has decreased 37 percent.
- Corn production has seen a 30 percent decrease in emissions per bushel.
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