Arc 320; cr 3. Sustainability is a characteristic of a process or state that can be maintained at a certain level indefinitely. Our current lifestyle is not sustainable because we base our energy requirements on burning fossil fuels that are running out, causing global warming and pollution. The key aim of the sustainable architecture approach is to help resolve the present energy crisis by designing self-sufficient buildings. The two basic principles applied are: reduction of energy needs and use of renewable forms of energy (solar, wind, geothermic, hydroelectric or biomass). Other topics touched upon in the course are: use of local building materials, study of the local traditional passive strategies (to create a pleasant home despite climate conditions), encouraging a sustainable lifestyle, co-housing.