When you imagine a farm, you’re probably thinking lots of land in a rural area with patchwork rows of crops. That’s how it has always been. But with more and more people moving to urban areas (an estimated 2/3 of the world’s population by 2050) and the acreage of arable farmland shrinking each year, we need a new model for local and nutritionally rich produce, and fast. One solution? Vertical farming.