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Lester Brown points out that the earth's four principal biological systems — fisheries, forests, grasslands and croplands — form the foundation of the global economic system and supply most of our raw materials. When human claims on these systems reach an unsustainable level, fisheries collapse, forests disappear, grasslands turn into wasteland, and croplands deteriorate. It can be inferred that when human demands on the biological systems become unsustainable:
Aindustry switches entirely to minerals
Bpopulation growth automatically stops
Cthe productivity of those systems is impaired and they collapse
Dthe systems regenerate faster
Answer & Solution
Correct answer: C. the productivity of those systems is impaired and they collapse
The passage says unsustainable demand impairs productivity, causing the systems to collapse.
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