All of the following factors contributed to major increases of U.S.food productivity since 1960 except

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The amount of cultivated land has not significantly increased since 1960, as much of the land that was suitable for farming was already being used for agriculture at that point. The other factors listed, such as increased use of fossil fuels and water, pesticides and inorganic fertilizers, factory farming, and advances in technology, have all contributed to major increases in food productivity since 1960.

All of the Following Factors Contributed to Major Increases of U.S.food