how are the earth's principal biological systems being detected?
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There are four principal biological systems of the Earth - (1) fisheries (2) forests (3) grasslands (4) croplands, as pointed by Mr Lester R Brown. Unfortunately, the human claims on these systems as reaching points, where their productivity is getting impaired. ... The forests precede mankind and deserts follow.
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The earths principal and biological system are being depleted by excessive use over fishing is quite common
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