As experts warn of a coming food crisis, the vertical farming industry aims to create plants that offer more nutritional value and require fewer resources. In vertical farms, plants are grown indoors. Each set of plants is stacked on another. Workers control the climate and closely monitor each plant’s growth. Vertical farm supporters say the methods are good for the environment, and good for the world’s growing population. Experts say the size of the vertical farming market is expected to quadruple over the next five years to nearly $4 billion. Because of the technology it has created, AeroFarms has become one of the top indoor-farming companies. One of its vertical farms is in a large building near a busy road in Newark, New Jersey. It grows more than 250 kinds of greens and herbs. Farmers wear gloves, coats and coverings on their head. Their shoes must be cleaned. AeroFarms grows crops at the same rate throughout the year.