Vertical integration

摘要

It provides food crops for zoo animals, but could a multi-storey cropping system provide the solution to feeding millions of humans too? A zoo may sound like the last place you would expect to find cutting-edge horticulture. But Paignton Zoo Environmental Park in Devon is pioneering what it describes as a "revolutionary" system to maximise crop yields in a tight space, which could open the door to large-scale "high-rise" growing worldwide.