Cities and metropolises worldwide are reinventing themselves in order to adapt to the global climate change challenges. At the beginning of the third Millenium, sustainable development as a response to the climate trends calls to a new, radical transformation of the urban humanity, where everyone needs to act responsibly. A great amount of cities have to rethink their energy resources consumption, as well as their food and material resources management. The City Scan Method reveals a constellation of different, interconnected systems. While checking their system connections, climate challenges demonstrate that their effectiveness depends mostly from their mutual interaction and their synergies – similar to the chemical chain reactions in human metabolism. For future cities, there is the need to think and start the urban mutations from topics connected to the environment: not only planning our urban forms, but also to unleash evolution potentials, tangibles or not.

