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What are the four systems that sustain life on earth and what threats are they facing according to the author of the lesson the ailing planet

Forests , grasslands , croplands and fisheries are the four systems that sustain life on earth. They are being cleared aggressively due to various reasons like fisheries are being cleared as people have become preotein conscious. Forests , grasslands and croplands are being cleared for industrialisation and human settlements.
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. Forests , grasslands , croplands and fisheries are the four systems that sustain life on earth.
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Mr Lester R. Brown in his thought-provoking book, The Global Economic Prospect, points out that the earth’s principal biological systems, i.e., fisheries, forests, grasslands, and croplands form the foundation of the global economic system. In addition to supplying our food, these four systems provide almost all the raw materials for industry except minerals and petroleum-derived synthetics. It is because of this that fisheries collapse, forests disappear, grasslands are converted into barren wastelands and croplands deteriorate. In a protein-conscious and protein-hungry world, over-fishing is common. In poor countries, local forests are being demolished in order to procure firewood for cooking. Since tropical forests house various species of life, they face extinction as a result of its destruction.
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