On the roofs of New York and Montreal, "ageekculturists" combine new technologies and agriculture to produce, in the heart of the city, fresh, pesticide-free vegetables.

In Singapore, space, a scarce resource today, is being saved by erecting agricultural towers ten meters high.

In the Netherlands, state-of-the-art light-emitting diodes (LEDs) watch over urban crops by replacing the sun's rays in winter.

If no agricultural skyscraper has emerged from the ground, the technologies that allow it already exist. Projects are thus flourishing around the world, the gigantism of which is not always unanimous. Some also fear the voracity of the agri-food industry, which could derail Dickson Despommier's dream. Young architects react and appropriate the founding principles of vertical farms with the aim of converting the cities of tomorrow into autonomous ecosystems.

The Serie : Cities of Tomorrow will reveal this exciting and fast-moving race against the clock to ready ourselves for this new urban reality. It will explore a range of extravagant, utopian and fantastic futuristic projects in a wide range of areas to illustrate concrete prototypes offering actual solutions that are applicable now. The series will take the viewer on a trip around the globe to discover the most innovative, emblematic and fascinating of these urban experiments, , through three episodes.