Фрагмент из книги:
The streets of growing cities are often built on old farm land, so food for the city’s sky-rocketing population has to come from further and further away, One solution may be to build farms inside the city - in small empty spaces between buildings, or even on rooftops. There are already such city farms in small cities like Havana and Vancouver, but the big challenge is to scale these up for megacities, where space is in even shorter supply. For this reason, some people envisage huge vertical farms in skyscrapers, where food can be grown on each floor.
