What are the Earth’s principal biological systems? What is their condition as stated by the author in ‘The Ailing Planet’?
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Mohan : Fisheries, forests, grasslands and croplands are the four principal biological systems of the earth. Geeta : They are the foundation of the global economic system. Meera : Overfishing is destroying fisheries.
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The earth's principal biological systems are being depleted by excessive use. Over . fishing is quite common. Forests are being cut to obtain firewood for cooking.
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