The exponential increase in the number of humans on the planet has resulted in the urgent need to find new strategies to deal with the housing issue. At a time when the future of the planet is a constant source of concern, it is worthwhile to re-examine how we design and build our homes and cities in order to meet the challenges of sustainable development. Constructing, using, maintaining and even destroying buildings incurs significant environmental costs, which is why some ARCHITECTS OF CHANGE are working on concepts that run counter to conventional trends in architecture and are attempting to adapt new building projects to today’s realities. Featured ARCHITECTS OF CHANGE: 1. Fabrice André (Engineer, rebuilt the Refuge du col de Sarenne, France) a mountain lodge in the Alps built in complete harmony with nature, in the heart of the Alps. 2. Rolf Disch (Solar Architect, Germany) participated in creating the Vauban eco-friendly residential district in Frieberg. 3. Jaime Lerner (Architect and innovative mayor of Curitiba, Brazil) promoted the city's development without neglecting environmental and social factors.