3. How are the earth’s principal biological systems being depleted?
Answers
Ans: There are four principal biological systems - fisheries, grasslands, forests, and croplands. These four systems provide food and raw materials for industry except for minerals and synthetics. These systems have reached an unsustainable point where their productivity have impaired. As a result, fisheries are collapsing, deforestation is taking place, grasslands are turning into barren wasteland and croplands are becoming worse. Overfishing is very common nowadays where people are becoming protein-conscious. In poor countries, the forest is being cut down on a large scale to obtain wood for cooking. In some areas, firewood is more costly than food. Many species are under destruction in tropical forests.
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