Why are many of the industrialized agriculture techniques popularized during the Green Revolution not sustainable?
A. They depend on fossil fuels, which cannot be replaced and whose use
harms the environment.
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B. They depend on labor performed by humans and by animals whose
populations are in decline.
C. They make planting and harvesting more efficient, which allows farmers to
feed growing populations.
D. They involve genetically modified organisms, whose full environmental
impact is unknown.