I have always been fascinated with the idea of urban farming. Type "urban farming" into Google and the variety of projects around the world is astonishing. The idea that city slickers can grow their own food appeals to me no end. The fact that we may HAVE to in the not too distant future is also at the back of my mind. This is exactly what happened in Havana, Cuba. Back story can be read here , here , here and here
When I lived in Durban I has a small veggie patch that produced an astounding array of veg. It was not much bigger than a double garage. The argument that many people have to NOT plant more food is that they do not have space. That is total BS.
The first time I became aware of people using every square inch in an urban setting was many moons ago on a visit to Dar es Salaam. Every bit of ground was used to grow something. The soil was a powdery sand but that did not stop people trying.
My son recently sent me photographs he took in South Korea.
Even roof tops and balconies are used. To prove that this is not a flash in the pan I am including a wider shot that spoilt by some sun flare, but you can get the idea.