Sustainable cities

The development of green, ecological city or Eco-city has been introduced as a mean to support sustainable urban development within a social, economic, environmental and demographic con-text (Tsolakis, Anthopoulos, 2015). The Eco-city concept was introduced by Urban Ecology, a non profit organization that was founded in 1975 by Richard Register (Roseland, 1997). An Eco-city ensures the well-being of its citizens via a holistic urban planning and management approach with the aim of eliminating waste and emissions (Register, 1987). From a systemic point of view, an eco-city can be described like a set of different complex sub-system that need to be associated or reconnected in order to deli-ver the desired outcomes (Diemer, Morales, 2016)