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Though population is expected to grow significantly, yield increase from food crops has been slowing down. Field of wheat under cloudy gray sky The population is expected to grow by 1% each year, but agricultural production needs to grow by 1.5% each year due to food waste. But, the growth rate needed for agricultural production may not be possible to sustain in the future because we have only so much space, energy, and resources. To increase yields in the past, Norman Borlau