This book proposes an innovative strategy to achieve the welfare state in the 21st century: reorient economic activities towards the construction and reconstruction of sustainable cities. In a global economy facing economic and political crises, Roberto Kozulj suggests that if the activities linked to urban development were reoriented towards public works, the problem of structural unemployment would tend to be solved to a large extent. Based on economic growth based on the activation of low-skilled employment, the maintenance and transformation of cities would allow sustainability to show its benefits. On one hand, future generations could have natural resources and a non-degraded environment and, on the other, exercise their opportunities to be inserted into the labor market.