50 years from now, cities will be home to 70% of all human beings. They will have seven billion mouths to feed and will face an immense challenge in terms of food supply. Are hydroponics and vertical farming going to solve this challenge?

In South Korea, China and Saudi Arabia, in Abu Dhabi and in Russia, a new kind of city is now under construction. These are prototypes of green, hyper-connected cities that are stuffed with digital technology and ecological equipment.