Dramatic urbanization is foreseen to make big cities centers of life, consumption and sometimes even production. In cities thousands of material flows and value chains of diverse sectors are interconnected to provide our comfort of life. Ironically, those logistical, industrial and consumer-related processes and networks have been damaging natural environment, polluting waters, air and eventually lowering the quality of life.

There is no doubt cities will further expand. But could this be continued in a sustainable way? How can we reduce our impact and reuse materials in cities? Which innovations and solutions are needed and how can citizens contribute to creation of sustainably built environment?