CNN interviews Professor Dickson Despommier about a new concept in farming produce, and that idea is called Vertical Farming. "It has grown into something now quite out of my control. It has blossomed into a concept, which suggests strongly that, if we can grow our food inside tall buildings, then it would save a lot of space outdoors; we could replant trees into, something where the ecosystems were damaged by farming. We could also supply a healthier food supply for people living in urban centers..." - Professor Dickson Despommier