Global: Is it time to change from outside horizontal to indoor vertical farming?

Most demographers agree that by 2050, the world's population will rise to at least 9.2 billion. It will take an increase to the world's agricultural land the size of Brazil to feed this population - far more than is available. Horizontal farming is destructive of ecosystems, habitat, and water and is a significant cause of climate change. Advocates of vertical indoor farming believe that - if practiced on a large scale in urban centres - it has potential to: sustainably feed the world. A single building 30 stories high with a city block footprint could feed 10,000 people.