The statement ' while vertical farming may be an urban substitute for spacious farmlands, there is no guarantee that it will be a reliable substitute for regular farms' is true.
Vertical farming is the process by which crops are grown in vertically stacked layers in a maintained controlled environment. The method of vertical farming is used in urban areas where there is less space for crops to grow.
However, we cannot consider vertical farming as a reliable substitute of regular farms because the maintenance level and cost of vertical farming is high. In regular farms, it will b difficult to induce techniques hydroponics, etc for the growth of plants.
Hence, vertical farming can not be a substitute for regular farming.
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